Described are heat-assisted magnetic recording heads that include near-field transducers having a magnetic inlay incorporated into the emitter disk, for example to improve write field properties such as the write field angle (decrease) and/or write field strength (increase), and which can contribute to increased areal density capability. Aspects involve applying an inlay of a magnetic material to the emitter disk of a near-field transducer. The inlay may optionally extend into the sunken disk of the near-field transducer. The inlay thickness, length, shape, and recess from the media-facing surface may be selected or adjusted to achieve desired magnetic, optical, and/or thermal characteristics.
Described are magnetic write heads for heat-assisted magnetic recording (HAMR) in which either or both of the heat sink disk or middle disk of the near field transducer are composed of magnetic materials. In addition, any diffusion barrier layers provided between the write pole and the heat sink or other components may include magnetic materials. Constructing write heads that include magnetic material containing components between the write pole and the near field transducer may result in increased areal density capability (ADC) due to lowering the magnetic field angle, decreasing the magnetic field rise time, and/or increasing the magnetic field strength.
Described are tiered data storage systems and methods for distributing data into high performance and low performance tiers based on an estimation of the frequency of use. Probabilistic data structures such as counting bloom filters may be used to provide a frequency of use estimation. However, the size of the probabilistic data structure may not be appropriate for all workloads. Accordingly, the size of probabilistic data structures can be dynamically adjusted based on workload, thus ensuring that the probabilistic data structure is large enough to be effective in frequency of use estimations, but not so large as to result in excess memory overhead. The efficiency of the probabilistic data structure may be determined by changes in request pattern as indicated by a unique virtual block address (VBA) ratio, as well as changes in block request hit rate.
providing business data analysis and business information services, namely, compiling, measuring, and reporting on the relationship between data capabilities and economic performance of publicly traded companies; preparing and maintaining an index based on such data for use in business benchmarking and market comparison; advertising, market studies, business appraisals and marketing research related to such an index
09 - Scientific and electric apparatus and instruments
Goods & Services
Computer storage devices, namely, blank hard drives for computers; data storage devices, namely, hard disk drives, solid state drives, solid state hybrid drives, and blank digital storage media; digital disk drives; removable hard drive based computer backup systems; electronic docking stations for data storage devices; external computer disk drives for the storage, backup and retrieval of information; downloadable computer software for operating external computer disk drives for the storage, backup and retrieval of information, and printed instructional manuals sold as a unit therewith
09 - Scientific and electric apparatus and instruments
Goods & Services
External computer disk drives for the storage, backup and
retrieval of information and downloadable computer operating
software programs and printed instructional manuals provided
therewith; downloadable computer software for operating
external computer disk drives for the storage, backup and
retrieval of information and printed instructional manuals
provided therewith.
7.
Laser diode for heat-assisted magnetic recording, and related apparatuses, devices, systems, and methods
Laser diodes that include a mirror stack on the light-exit facet. The mirror stack has a reflectivity into the active region that is greater in air than when the laser diode is integrated into an apparatus. Related apparatuses, data storage devices, computing systems, and methods.
The technology disclosed herein provides an electrowetting on dielectric device (EWOD). Implementation of the EWOD disclosed herein includes a substrate, an electrode layer configured on top of the substrate, a dielectric layer configured on the electrode layer, wherein the dielectric layer comprises a nano-patterned top surface, a top plate, a micro-fluidic channel configured between the top plate and the dielectric layer comprises a nano-patterned top surface, and a hydrophobic layer between the dielectric layer comprises a nano-patterned top surface and the micro-fluidic channel. In some implementations, a hydrophobic layer may be configured on top of the dielectric layer having a nano-patterned top surface and the micro-fluidic channel configured between the top plate and the hydrophobic layer.
Described are methods of forming write poles using physical vapor deposition or chemical vapor deposition of FeCoX magnetic material alloys, where the X element is selected to produce properties such as oxidation resistance, corrosion resistance, and sufficiently high magnetic moment. Once an initial portion of the write pole is formed by depositing the FeCoX alloy, the remainder of the write pole may be formed by electroplating an FeCo-based alloy using the deposited FeCoX as an electroplating template, or by deposition of additional FeCoX material to form the bulk of the write pole.
G11B 5/31 - Structure or manufacture of heads, e.g. inductive using thin film
C23F 17/00 - Multi-step processes for surface treatment of metallic material involving at least one process provided for in class and at least one process covered by subclass or or class
C25D 5/34 - Pretreatment of metallic surfaces to be electroplated
C25D 5/50 - After-treatment of electroplated surfaces by heat-treatment
Described are methods for protecting biometric templates using secret sharing in such a way that authentication can be performed without reconstruction of the biometric template. This can help protect against the security and privacy risks of storing biometric templates. Accordingly, the described methods use k-out-of-n secret sharing to distribute the template to some a number of parties, and when a user wishes to authenticate, k shares of a newly generated input template (produced from input biometrics) may be distributed by additive secret sharing to k parties. Each party computes a parameter based on its share of the biometric template and the input template without receiving any information about the other shares. The parameters are combined in a way that produces a Hamming distance, which may be compared to an authentication threshold to determine authenticity of the input.
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
G06V 40/50 - Maintenance of biometric data or enrolment thereof
Described are electrical sensors for measuring the insertion loss spectrum of fluids such as immersion cooling liquids. Such insertion loss sensors have a roughly U-shaped detection trace that is devoid of sharp corners to thereby allow for a sufficiently long trace in a relatively compact design and in which the electrical connectors can be disposed on the same end of the printed circuit board on which the detection trace is formed. Such designs may provide for the use of smaller volumes of cooling liquid contained in smaller containers, as well as for avoiding the immersion of the electrical connectors into the cooling liquid that is being tested.
G01N 27/22 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
A recording head has a write pole with a pole tip extending to a media-facing surface of the recording head. A peg coupler is located on a substrate-parallel surface of the pole tip and extending to the media facing surface. A near-field transducer is proximate the media-facing surface and includes a plate-like, enlarged part with a peg extending from the enlarged part towards the media-facing surface. The peg separated is separated in a downtrack direction from the peg coupler by a coupling gap. The enlarged part has a coupling surface facing the write pole, and includes an inlay on or near the coupling surface and spaced away from the peg. The inlay extends at least partially through a thickness of the enlarged part in the downtrack direction and extends between opposing crosstrack edges of the enlarged part.
G11B 5/31 - Structure or manufacture of heads, e.g. inductive using thin film
G11B 5/012 - Recording on, or reproducing or erasing from, magnetic disks
G11B 13/08 - Recording simultaneously or selectively by methods or means covered by different main groupsRecord carriers thereforReproducing simultaneously or selectively therefrom using near-field interactions or transducing means and at least one other method or means for recording or reproducing
13.
EWOD DEVICE WITH PARTICLE-EMBEDDED POLYMER COATING
The technology disclosed herein provides an electrowetting on dielectric device (EWOD). Implementation of the EWOD disclosed herein includes a substrate, an electrode layer configured on top of the substrate, a dielectric layer configured on the electrode layer, wherein the dielectric layer comprises polymers embedded with miniscule-sized particles, a top plate, and a micro-fluidic channel configured between the top plate and the dielectric layer comprises a nano-pattered top surface. In one implementation, the EWOD device includes a hydrophobic layer on top of the dielectric layer.
Described are systems, methods, and media for magnetic recording assisted by the use of ultrafast pulses such as ultrafast laser pulses. A layered magnetic medium includes a thin, magnetically softer capping layer disposed over a magnetically harder data recording layer. The capping layer is configured to have fast magnetization dynamics, and to have faster magnetization dynamics than the data recording layer. Due to the fast magnetization dynamics of the capping layer, ultrafast pulses can be used to assist a magnetic write field in magnetizing the capping layer without inducing any significant heating in the bulk of the media. The magnetization of the capping layer nucleates magnetization in the data recording layer under the influence of the magnetic write field.
G11B 5/66 - Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
G11B 5/667 - Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers including a soft magnetic layer
15.
IMMERSION COOLING JACKET AND METHOD FOR LOCALIZED AND TARGETED COOLING OF ELECTRONIC DEVICES
Described are cooling jackets, cooling jacket assemblies, and cooling jacket systems for localized and targeted immersion cooling of individual electronic devices. As such, individual devices may be immersed using individual device cooling units that are used to provide targeted cooling to those portions of the device that contribute most to heating. Localized immersion cooling jackets and assemblies may be used to replace current whole-system immersion cooling. For localized and targeted cooling of hard disk drives, cooling jackets may be provided that function to better concentrate the cooling action at the circuit board where the heat generating chips may be located. The cooling jackets may be configured to have interface adaptors to facilitate connecting the devices being cooled to system connectors.
Disclosed are methods for electronic device authentication in which distinguishing physical characteristics of electronic devices are converted into unique identification strings (UIDs) that can be used like fingerprints to verify device authenticity. Such methods may be used for tamper detection, for example in combatting warranty fraud. UIDs may be generated from physical characteristics that are unique to a given device, such as imperfections on the device exterior or unique aspects of a circuit board. Images of the device in selected areas or at selected angles may be captured and provided to an algorithm that converts the physical characteristics of the physical device into a UID, for example making use of a fuzzy extractor. When a device is presented for authentication, images of the device may be similarly converted into a verification string that can be checked against the UID.
G06F 21/73 - Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information by creating or determining hardware identification, e.g. serial numbers
17.
NFT back reflection monitor for heat-assisted magnetic recording head
Disclosed are methods and configurations for monitoring reflections in heat-assisted magnetic recording (HAMR) heads that may lead to laser instability and power variation. HAMR heads direct light emitted by a laser toward a near field transducer (NFT) for the production of plasmons that assist in data recording. A certain amount of the laser light may be reflected at or near the NFT back toward the laser, and this reflected light can cause laser instabilities over time. As a screening measure during manufacturing or assembly, or as a laser health monitoring measure during drive operation, a back reflection monitor is used to detect the intensity of a portion of the reflected light. Back reflection monitoring capability may be provided by a bolometer integrated into HAMR recording head assemblies, and optionally along with optical components and electrical circuitry that provides laser light transmission monitoring capability.
The present disclosure relates to target plates for sputtering a material to form a layer of material on a substrate. In some embodiments, a target plate is made up of two or more discrete sections and/or has at least one recess to help reduce or avoid hotspots created by a rotating plasma ring created during sputtering. The present disclosure also relates to methods of actively heating and/or cooling different regions of a heat-sink backing plate while sputtering material to reduce or avoid hotspots created by a rotating plasma ring created during sputtering.
Described are systems and methods for tri-level recording of bits on granular magnetic media, for example using a magnetic writer of a hard disk drive. Tri-level recording of bits involves recording magnetic states that can be read as three distinct levels by a magnetic reader. Tri-level recording within a single recording layer of the granular magnetic storage media can be accomplished by recording bits in a neutral bit state as well as in an up bit state and a down bit state. Neutral bits are recorded by doubling the write frequency so that the write field is reversed over the span of writing a single bit. The resulting neutral bit includes grains whose magnetic states are roughly evenly mixed between up states and down states.
G11B 5/00 - Recording by magnetisation or demagnetisation of a record carrierReproducing by magnetic meansRecord carriers therefor
G11B 5/65 - Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent characterised by its composition
An apparatus includes an enclosure and a coolant recirculation assembly. The enclosure includes a first disk drive and a second disk drive. The coolant recirculation assembly includes a first casing and a pump. The first casing is configured to contain a liquid coolant and includes a first portion positioned between and in contact with the first and second disk drives. The pump is configured to circulate the liquid coolant. The conduit assembly fluidly connects the first casing and the pump. A method includes providing a first casing in an enclosure, the first casing configured to contain a liquid coolant; positioning a first disk drive in the enclosure in contact with the first casing; and moving the liquid coolant through the first casing past the first disk drive, wherein the first casing prevents contact between the liquid coolant and the first disk drive.
An apparatus includes a chassis configured to store a plurality of hard disk drives, wherein the chassis has a width between opposed sidewalls and a length. The chassis includes a bottom wall and first, second and third connectors. The bottom wall includes a plurality of columns of connectors disposed across the width. The first connector is disposed on the bottom wall in a first column. The second connector is disposed on the bottom wall in a second column that is adjacent the first column, the second column being positioned at a first width distance from the first column. The third connector is disposed on the bottom wall in a third column that is adjacent the second column, the third column being positioned at a second width distance from the second column. The first width distance is different from the second width distance.
An assembly includes a data storage disk and a spacer ring. The data storage disk includes a disk surface and first and second disk steps. The disk surface defines a x-y plane and includes a plurality of data tracks surrounding a first central opening. The first disk step is disposed proximate the first central opening at a first disk step level measured in a z direction from the disk surface. The second disk step is disposed proximate the first central opening at a second disk step level that is different from the first disk step level. The spacer ring includes a ring surface and first and second ring steps. The ring surface surrounds a second central opening. The first and second ring steps are disposed proximate the second central opening at first and second ring step levels, respectively. In the assembly, the disk surface faces the ring surface.
G11B 25/04 - Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing using flat record carriers, e.g. disc, card
G11B 17/038 - Centering or locking of a plurality of discs in a single cartridge
An electronics enclosure includes a fixed part that attaches to a rack and a sliding part that houses equipment. The sliding part is slidably disposed in the fixed part. The fixed part has a floor that is adjacent to a bottom of the sliding part. A cable harness has a first end attached to a back end of the sliding part and a second end attached to a back end of the fixed part. The cable harness includes a cable extending from the first to second ends of the cable harness. The cable harness includes at least one puck that is fastened to the cable and allows the cable to bend at the puck between the first and second ends along a bendable axis. The puck is slidable along the floor of the fixed part when the sliding part is transitioned between a closed state and an opened state.
Laser diode having a p-metal electrical contact that includes a metal adhesion layer disposed on the p-type region of the semiconductor laser structure, and a metal bi-layer disposed on the metal adhesion layer. The metal bi-layer includes a first metal layer disposed on the metal, adhesion layer, and a second metal layer disposed on the first metal layer. A metal conductive layer is disposed on the second metal layer. Related apparatuses, data storage devices, computing systems, and methods.
A data storage system for use in a high radiation environment includes an array of storage drives. Each of the storage drives includes a non-radiation-hardened drive controller, a non-radiation-hardened non-volatile storage medium, and a non-radiation-hardened volatile memory. A radiation-hardened storage controller is coupled to the array, the radiation-hardened storage controller provides host access to the array. One or more compute cores are configured to locally perform at least one operation on data stored on one or both of the non-volatile storage medium and the volatile memory based on a computational storage function received from the host.
Disclosed are sealed-enclosure disk drives that utilize diffusion barriers to prevent volatile organic contaminants (VOCs) from migrating or flowing through interstitial spaces between covers of the disk drives, and thereby reaching the interior space where components reside that may be susceptible to VOCs. Accordingly, a diffusion barrier is disposed between the top cover and the process cover of the hard drive and positioned to reside in a migration path of VOCs to the interior space. The VOCs are primarily produced by a source of VOCs located in interstitial spaces between the covers, for example an adhesive that bonds the covers, a vibration dampener material, or the like. The diffusion barrier may include activated carbon selected to absorb and/or sequester VOCs.
An apparatus includes a write head. A preamplifier is coupled to the write head. A controller is coupled to the preamplifier and configured to cause the preamplifier to apply an overshoot current to the write head for a predefined overshoot current duration, apply an undershoot current to the write head for a predefined undershoot current duration, and apply a steady-state current to the write head after the undershoot current duration, the steady-state current being greater than the undershoot current.
Disclosed are systems and methods for reducing the amount of time required before resuming full data operations after a hard disk drive has been spun down and/or placed in a standby mode. Such systems and methods may make use of thresholds to changes in environmental parameters, such as temperature, that may affect hard disk drive calibrations. Environmental parameter changes below a threshold may allow a subset of calibrations to be skipped or otherwise reduced to resume data operations. In addition or alternatively, a hard disk drive may be placed in a read-only mode prior to performing all calibrations needed to resume full write operations.
A single chip data storage device includes an array of storage drives each comprising a drive controller, a non-volatile storage medium, and a volatile memory. A storage controller is coupled to the array, the storage controller providing host access to the array. One or more compute cores are configured to locally perform at least one operation on data stored on one or both of the non-volatile storage medium and the volatile memory based on a computational storage function received from the host.
Single-transverse-mode laser diodes that include a bowtie-shaped ridge waveguide. Related apparatuses, data storage devices, computing systems, and methods.
A magnetic stack having a magnetic recording layer. The magnetic recording layer includes a plurality of ferromagnetic, discrete regions located within a matrix of at least one magnetic composition that is antiferromagnetic. Each ferromagnetic, discrete region corresponds to a magnetic domain for storing a bit of data. Related data storage devices, systems, and methods.
A sender may provide, to a recipient, encrypted DNA material comprising a set of DNA fragments. The sender may provide, to the recipient, a decryption key including instructions for ligating the set of DNA fragments to construct an encoded DNA strand having a nucleotide sequence that encodes a message.
An electronic device includes a cover coupled to a base to create an enclosure. One or more electronic components are positioned within the enclosure. A metallic seal is positioned between the cover and the base. The seal can be formed as a pre-cut gasket comprising indium or a layer of electroplated indium.
A dealer receives a first addend function and a second addend function. A function client provides first validation parameters, each first validation parameter corresponding to a coefficient of the first addend function and a corresponding coefficient of the second addend function. The sum of the first addend function and the second addend function equals the polynomial function. The dealer generates a function share for each share party based on a sampling of first random polynomials and second random polynomials and generates second validation parameters for each share party based on the function shares. The dealer transmits the second validation parameters to the share parties and transmits each function share to a corresponding share party. Each function share is verifiable by the corresponding share party based on the second validation parameters and a signed concatenation of the first validation parameters.
H04L 9/30 - Public key, i.e. encryption algorithm being computationally infeasible to invert and users' encryption keys not requiring secrecy
H04L 9/32 - Arrangements for secret or secure communicationsNetwork security protocols including means for verifying the identity or authority of a user of the system
35.
Energy-assisted recording head having coated nanorod near-field transducer
A near-field transducer for an energy-assisted, magnetic recording head includes a first part comprising a first plasmonic material. The first part has an enlarged portion configured to receive optical energy from a waveguide and a narrowed portion that receives and channels the optical energy to a recording medium. The near-field transducer includes a second part comprising a nanorod of a second plasmonic material different than the first plasmonic material. The nanorod is disposed within the first part along a light propagation direction of the near-field transducer and extends to a media-facing surface of the recording head along a light propagation direction. The narrowed portion of the first part covers at least three sides of the nanorod along the light propagation direction. The nanorod has an exposed end that is exposed from the near-field transducer and faces the media-facing surface.
A magnetic stack includes a magnetic recording structure and at least two heat-sink layers where heat-sink layer located furthest from the magnetic recording structure has thermal conductivity equal to or greater than intervening heat-sink layers. One or more interlayers can be included in the magnetic stack. Data storage devices and systems including one or more of the magnetic stacks, and related methods.
A multi-actuator storage device includes a first actuator supporting a first read element coupled to a shared read channel, a second actuator supporting a second read element coupled to the shared read channel, and a job scheduler that employs a lowest-access time selection methodology when selecting each next job to schedule on the first actuator. When the lowest-access-time methodology results in the selection of a read job for execution by the first actuator, the job scheduler identifies a pending job for execution by the second actuator that can be executed concurrent to the first read job without concurrently accessing the read channel and schedules the pending job on the second actuator concurrent to the first read job.
An apparatus includes a hollow piezoelectric stator of symmetrical cross-section about two orthogonal axes. The stator includes first outer and inner faces, wherein the first outer face includes a first contact tip; second outer and inner faces; third outer and inner faces; fourth outer and inner faces; and eight electrode portions, wherein one of the eight electrode portions is positioned on each of said faces. A method of moving a rotor along a y-axis relative to an object is disclosed, wherein an orthogonal x-axis direction is normal to an engagement surface of the rotor at a first contact tip of a piezoelectric stator. The method includes positioning a first portion of a preload mechanism in a hollow space of the piezoelectric stator, attaching a second portion to the object, and moving the first contact tip along an elliptical path in an x-y plane to frictionally couple the engagement surface.
A non-metallic media substrate includes a disc-shaped substrate body having at least one media storage surface on a face thereof. The substrate body has a center opening having an inner diameter and an outer diameter surface, and the substrate body has a thickness. The substrate further includes an annular groove at the outer diameter of the media substrate, the annular groove having chamfered edges and an internal concavity extending toward the inner diameter.
G11B 5/84 - Processes or apparatus specially adapted for manufacturing record carriers
G11B 23/00 - Record carriers not specific to the method of recording or reproducingAccessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus
40.
Crash stop that includes silicone rubber for a data storage device, and related articles, systems, and methods
Data storage devices that include one or more crash stops that include cured, silicone rubber. Related articles (e.g., shock-absorbing member) that include cured, silicone rubber for crash stops and methods of making shock-absorbing members that include cured, silicone rubber.
Described are systems and methods for performing read after write operations in multi-revolution hard disk drives, which involve comparing the results of a read after write operation to a conditioned version of the write data that is retained in buffer memory. By conditioning the write data, a synthetic read-back signal can be fashioned that emulates the signal produced when reading the magnetic disk. Such an emulated read-back signal can be directly compared to the signal read from the magnetic disk by correlation and threshold checking, or the emulated read-back signal can be combined with the read-back signal and then compared against the write data residing in the buffer memory in a data verification operation. The data verification may be qualitative so that error codes may be developed and stored.
A method comprising the steps of forming a recording head comprising a waveguide, a heat sink and a bleed resistor on a first substrate, is described. The bleed resistor is coupled to the heat sink and the substrate. The top surface of the heat sink is planarized to form a planarized heat sink. A laser diode formed on a second substrate is transfer printed onto the planarized heat sink to form an integrated laser diode.
A hard disk drive includes a heat-assisted magnetic recording head and an enclosure. The enclosure is configured to contain the heat-assisted magnetic recording head and other components of the hard disk drive. The enclosure includes a base and a thermally processed top cover including a thermally oxidized interior surface. Preferably, a composition of the thermally oxidized surface of the thermally processed top cover comprises at least 5 percent oxygen. More preferably, an average oxidation depth of the thermally oxidized surface of the thermally processed top cover is at least 8 nanometers.
G11B 33/14 - Reducing influence of physical parameters, e.g. temperature change, moisture, dust
G11B 25/04 - Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing using flat record carriers, e.g. disc, card
G11B 33/02 - CabinetsCasesStandsDisposition of apparatus therein or thereon
G11B 5/00 - Recording by magnetisation or demagnetisation of a record carrierReproducing by magnetic meansRecord carriers therefor
44.
Hard disk drive direct metadata and data caching to host memory buffer via nonvolatile memory express
Described are data processing and storage systems, and methods for use therewith, that make use of a host memory buffer (HMB) partition of one or more host devices to directly cache at-risk data from one or more HMB-aware hard disk drives (HDDs) via remote direct memory access over nonvolatile memory express interfaces and protocols.
The present disclosure describes a system and methods for the generation of DNA strands and querying a DNA database rapidly and accurately. The method disclosed includes the generating at least one database single stranded DNA (ssDNA) strand, includes a plurality of functional oligonucleotides separated by introns. On one end of each intron there is a donor fluorophore and on the other end is an acceptor fluorophore. A query ssDNA strand is also generated that includes a series of complimentary oligonucleotides, which can hybridize with the functional oligonucleotides of the database ssDNA strand. Hybridization causes the intron regions of the database ssDNA strand to fold resulting in the donor fluorophore and acceptor fluorophore being placed in close proximity to one another. The close proximity enables Förster Resonance Energy Transfer (FRET) phenomena to occur, which is detected using a photodetector.
A magnetic recording head includes a piezoelectric actuator for controlling head-media spacing. A method for making the magnetic recording head including a piezoelectric actuator includes the steps of: providing a source wafer on which to fabricate the piezoelectric actuator; providing a target wafer; fabricating the piezoelectric actuator on the source wafer; releasing the piezoelectric actuator from the source wafer; and placing the piezoelectric actuator on the target wafer.
H10N 30/03 - Assembling devices that include piezoelectric or electrostrictive parts
H10N 30/05 - Manufacture of multilayered piezoelectric or electrostrictive devices, or parts thereof, e.g. by stacking piezoelectric bodies and electrodes
H10N 30/074 - Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing
H10N 30/082 - Shaping or machining of piezoelectric or electrostrictive bodies by etching, e.g. lithography
47.
Forming a heat channel on a magnetic write pole using an adhesion layer
Described are write head constructions that may be useful in magnetic recording, and in particular for heat-assisted magnetic recording. Such write head constructions include a heat channel abutted to the write pole to facilitate transferring heat away from the write pole and other components near the media-facing surface of the write head. To help prevent diffusion of materials between the heat channel and the write pole, a diffusion barrier layer is provided. Properties such as thermal expansion mismatch, the presence of oxide in the diffusion barrier layer, and so forth, may lead to undesired delamination of the heat channel during fabrication of the write head and/or during operation. In accordance with the present disclosure, an adhesion layer may be provided between the diffusion barrier layer and the heat channel to improve adhesion of the heat channel and effectively reduce delamination.
G11B 5/31 - Structure or manufacture of heads, e.g. inductive using thin film
G11B 5/02 - Recording, reproducing or erasing methodsRead, write or erase circuits therefor
G11B 13/08 - Recording simultaneously or selectively by methods or means covered by different main groupsRecord carriers thereforReproducing simultaneously or selectively therefrom using near-field interactions or transducing means and at least one other method or means for recording or reproducing
G11B 5/00 - Recording by magnetisation or demagnetisation of a record carrierReproducing by magnetic meansRecord carriers therefor
Described are systems, methods, and media for magnetic recording assisted by the use of ultrafast pulses such as ultrafast laser pulses. A layered magnetic medium includes a thin, magnetically softer capping layer disposed over a magnetically harder data recording layer. The capping layer is configured to have fast magnetization dynamics, and to have faster magnetization dynamics than the data recording layer. Due to the fast magnetization dynamics of the capping layer, ultrafast pulses can be used to assist a magnetic write field in magnetizing the capping layer without inducing any significant heating in the bulk of the media. The magnetization of the capping layer nucleates magnetization in the data recording layer under the influence of the magnetic write field.
G11B 5/66 - Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
G11B 5/667 - Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers including a soft magnetic layer
A system may receive, in a data read request, a DNA subsection identifier identifying a subsection of a synthesized DNA strand. The system may identify, in the subsection of the DNA strand: a first linker nucleotide subsequence (L1S) corresponding to a first end section at which the subsection was synthesized to an anterior subsection of the synthesized DNA strand, and a central nucleotide subsequence (CS) corresponding to at least a part of a central section that separates the first end section from a second end section of the subsection at which subsection was synthesized to a posterior subsection of the synthesized DNA strand. The system may determine, based on one or more nucleotides of the CS and one or more nucleotides of the L1S, data responsive to the data read request. The system may provide, responsive to the data read request, the data.
The technology disclosed herein provides a method of sharing a memory appliance memory between multiple devices, the method including scanning by a host device, at host boot up, a plurality of memory devices to determine if one of the plurality of devices is a compatible memory device, reconfiguring the compatible memory device as offline system memory, receiving from the compatible memory device an indication of an amount of shared memory available on the compatible memory device, and labeling each block of a plurality of memory blocks on the compatible storage device as offline within a host memory map on the host device.
A device may include an enclosure. The device may include a plurality of storage drives configured along a length of the enclosure from a front of the enclosure to a rear of the enclosure, the enclosure surrounding the plurality of storage drives at least in part. The device may include a duct configured along the length of the enclosure, the duct configured to communicate an airflow from the front of the device to a power supply unit (PSU) located near a rear of the device.
A data storage device includes a stack of data storage disks, a head stack assembly, and a piezoelectric motor. The head stack assembly includes an arm, a load beam, a head and a tail. The arm is configured for pivotal motion about a longitudinal axis of an actuator shaft. The load beam is attached to the arm. The head is attached to the load beam and is configured to interact with a surface of one of the disks, the surface defining an x-y plane. The tail is disposed on an opposite side of the actuator shaft from the arm and has a first engagement surface that is parallel to the x-y plane. The piezoelectric motor includes a piezoelectric element and a contact tip. The piezoelectric element comprises a first mounting surface. The contact tip is disposed at the first mounting surface and frictionally contacts the engagement surface.
The technology disclosed herein provides a method including determining a location of a storage device in a storage enclosure, based on the location of a storage device in a storage enclosure, determining environmental associated with the location of the storage device, determining achievable capacity of the storage device based on the environmental parameters associated with the location of the storage device, and formatting the storage device based on the determined achievable capacity.
Disclosed are methods for linearizing the response of a non-linear magnetic reader, for example in the operation of a hard disk drive. Magnetic readers generally exhibit non-linearities in their response to an applied magnetic field, and those non-linearities may be particularly pronounced when the field strength is high. This deviation from linearity at larger field strengths can limit the useful range of field amplitudes. To expand the useful range of field amplitudes and thereby increase the available signal at the reader, the reader bias current may be varied in such a way to compensate for the natural non-linearity of the reader, thus making the reader output signal linear over a larger range of detected field strengths.
Described are electrodeposition methods, and materials and structures prepared by electrodeposition methods, and devices prepared from the electrodeposited materials.
A query vector is directed to a vector database that stores a plurality of vectors that are indexed into a plurality of clusters. In response to receiving the query vector, a furthest vector is found with an approximate maximum distance from the query vector by selecting a furthest cluster having a centroid furthest from the query vector. The query vector and furthest vector are placed into a subset. At least one diverse vector is added into the subset by performing one or more repetitions involving: determining another furthest cluster having another centroid furthest from all vectors in P; selecting another vector from the other furthest cluster that is furthest from all the vectors in P; and inserting the other vector into P. The subset P is used to provide a response to a diversity query.
Provided are devices, and methods for use with devices, that generate oxygen from residual humidity within a sealed enclosure that is filled primarily with an inert gas. A PEM electrolyzer that is configured to generate oxygen from residual humidity is situated within the sealed enclosure. The PEM electrolyzer includes a PE membrane disposed between an anode and a cathode, and further includes a hydrogen getter. The hydrogen getter helps the PEM electrolyzer to be a net producer of oxygen. Exemplary sealed enclosure devices include hard disk drives such as HAMR hard drives filled primarily with helium.
G11B 33/14 - Reducing influence of physical parameters, e.g. temperature change, moisture, dust
G11B 25/04 - Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing using flat record carriers, e.g. disc, card
58.
DATA STORAGE DEVICE INCLUDING AN ADSORBENT COMPOSITION, AND RELATED ARTICLES, SYSTEMS, AND METHODS
Data storage devices that includes one or more articles. An article includes an adsorbent composition having one or more molecular sieves for adsorbing one or more organic compounds, and a binder component that includes at least one cured rubber. Related methods of making an article.
B01J 20/28 - Solid sorbent compositions or filter aid compositionsSorbents for chromatographyProcesses for preparing, regenerating or reactivating thereof characterised by their form or physical properties
B01J 20/30 - Processes for preparing, regenerating or reactivating
G11B 33/14 - Reducing influence of physical parameters, e.g. temperature change, moisture, dust
59.
MOVABLE MAGNETIC PARTICLE MEMORY DEVICE OPERATIONS
A data storage apparatus is presented that includes a well structure comprising a suspension medium, and a magnetic particle disposed in at least a portion of the well structure. A control system is configured to represent a data state corresponding to a positioning of the magnetic particle within the well structure, the magnetic particle moved responsive to an applied field and a present material state of the well structure. Various addressable arrays of well structures and associated control elements can be established to form data storage devices.
G11C 11/16 - Digital stores characterised by the use of particular electric or magnetic storage elementsStorage elements therefor using magnetic elements using elements in which the storage effect is based on magnetic spin effect
60.
Multi-revolution hard disk drives with reduced servo overhead
Disclosed are hard disk drives (HDDs), and methods for use therewith, that utilize reduced overhead servo fields, thereby simplifying the servo system. Reduced overhead servo fields may be of particular use in HDDs that utilize multi-revolution storage techniques to store data at much higher densities than what is possible for conventional HDDs. The relaxed performance requirements of high-density, multi-revolution drives provides opportunities for reducing servo overhead, thereby potentially further increasing the areal density capability of the magnetic media. Servo overhead may also be reduced by placing certain servo data on flash or other memory off of the media disk rather than in the servo fields written to the media disk.
G11B 5/55 - Track change, selection, or acquisition by displacement of the head
G11B 5/52 - Disposition or mounting of heads relative to record carriers with simultaneous movement of head and record carrier, e.g. rotation of head
G11B 5/58 - Disposition or mounting of heads relative to record carriers with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
G11B 5/596 - Disposition or mounting of heads relative to record carriers with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
G11B 20/12 - Formatting, e.g. arrangement of data block or words on the record carriers
09 - Scientific and electric apparatus and instruments
Goods & Services
External computer disk drives for the storage, backup and retrieval of information and downloadable computer operating software programs and printed instructional manuals provided therewith; downloadable computer software for operating external computer disk drives for the storage, backup and retrieval of information and printed instructional manuals provided therewith
09 - Scientific and electric apparatus and instruments
Goods & Services
External computer disk drives for the storage, backup and retrieval of information and downloadable computer operating software programs and printed instructional manuals provided therewith; downloadable computer software for operating external computer disk drives for the storage, backup and retrieval of information and printed instructional manuals provided therewith
09 - Scientific and electric apparatus and instruments
Goods & Services
External computer disk drives for the storage, backup and retrieval of information and downloadable computer operating software programs and printed instructional manuals provided therewith; downloadable computer software for operating external computer disk drives for the storage, backup and retrieval of information and printed instructional manuals provided therewith
09 - Scientific and electric apparatus and instruments
Goods & Services
External computer disk drives for the storage, backup and retrieval of information and downloadable computer operating software programs and printed instructional manuals provided therewith; downloadable computer software for operating external computer disk drives for the storage, backup and retrieval of information and printed instructional manuals provided therewith
A third party cryptographically determines a private set difference between a data set of a first party and a data set of a second party. The third party cryptographically generates a key pair including a private key and a public key, provides the public key to the first party and the second party, receives an encrypted result from the second party, wherein the encrypted result is computed prior to receipt by the third party using homomorphic operations performed using the public key, the data set of the first party, and the data set of the second party, decrypts the encrypted result using the private key to yield an intermediate data set, and determines the private set difference between the first data set and the second data set based on the intermediate data set.
H04L 29/06 - Communication control; Communication processing characterised by a protocol
H04L 9/00 - Arrangements for secret or secure communicationsNetwork security protocols
H04L 9/06 - Arrangements for secret or secure communicationsNetwork security protocols the encryption apparatus using shift registers or memories for blockwise coding, e.g. D.E.S. systems
H04L 9/14 - Arrangements for secret or secure communicationsNetwork security protocols using a plurality of keys or algorithms
66.
THIRD-PARTY PRIVATE SET INTERSECTION FOR MULTIPLE INPUT PARTIES
A method computes, by a third party, a private set intersection of datasets of multiple input parties, wherein each dataset includes one or more data elements. The computer-processor-implemented method includes: obtaining one or more share polynomials for each dataset of the multiple input parties, the one or more share polynomials for a dataset of an input party being encoded from shares of zero for the input party, each share of zero corresponding to a data element of the dataset of the input party; determining an intersection polynomial based on the one or more share polynomials; and determining the private set intersection of the datasets to include data elements of the datasets of the multiple input parties for which the intersection polynomial of the multiple input parties solves to zero.
A processor may determine, for each subdevice of a set of subdevices of a storage enclosure device, one or more operational measures of the subdevice. A processor may determine, based at least on the one or more operational measures for the subdevices and one or more environmental characteristics associated with the subdevices, a set of striping groups that optimizes an operational measure of the set of subdevices of the storage enclosure device, each striping group including a respective subset of the set of subdevices. A processor may store output data of a data striping operation to a particular subset of subdevices associated with a particular striping group of the set of striping groups.
A method of aligning a semiconductor device for use in a storage device disclosed herein includes providing a semiconductor device on a first substrate. The first substrate includes a first alignment mark. A recording head comprising a second alignment mark is provided on a second substrate. A transfer print head comprising a third alignment mark is also provided. The transfer print head is aligned to the semiconductor device on the first substrate. After the transfer print head is aligned to the semiconductor device, the semiconductor device is transfer printed from the first substrate onto the second substrate. The transfer printing includes aligning the third alignment mark on the transfer print head to the second alignment mark on the second substrate.
Described are three-transducer piezoelectric motors capable of being operated in an ultrasonic mode over a narrow range of driving frequencies and of being operated in an inchworm mode at driving frequencies outside of, and below, the narrow range. The piezoelectric motors are designed such that all three transducers have the same or nearly the same expansion resonant frequency, thus enabling the motors to be operated in an ultrasonic mode when using a driving frequency at or near the expansion resonant frequency, as well as being operable in a normal inchworm mode at other driving frequencies. The inchworm mode allows for precise and controlled positioning and movement, whereas the ultrasonic mode allows for large movements over short periods.
H02N 2/02 - Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuatorsLinear positioners
A film layer is disclosed having a graded index of refraction and layer stacks, along with processes and apparatuses for making film layers. The graded index of refraction may have a continuous change through thickness of the film layer. The film layer may be made of a cation oxynitride material. Film layers may be made by using a sputtering source and varying gas flows over time, or by moving or positioning a substrate within PVD zones having lower and higher index of refraction material deposition.
C03C 17/34 - Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
C03C 17/22 - Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating with other inorganic material
C03C 17/245 - Oxides by deposition from the vapour phase
C03C 17/36 - Surface treatment of glass, e.g. of devitrified glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating being a metal
A heater for a disc substrate in a deposition system. The heater has a central first heating zone and an annular second heating zone around the first heating zone. Each of the heating zones has an independently controllable power supply to allow, for example, the second heating zone to be heated to a temperature at least 10° C. greater than the first heating zone.
A magnetic stack includes a magnetic recording structure and at least two heat-sink layers where heat-sink layer located furthest from the magnetic recording structure has thermal conductivity equal to or greater than intervening heat-sink layers. One or more interlayers can be included in the magnetic stack. Data storage devices and systems including one or more of the magnetic stacks, and related methods.
A heat-assisted magnetic recording hard disk drive includes a heat-assisted magnetic recording head and a component. The heat-assisted magnetic recording head and the component are disposed in an interior volume of the heat-assisted magnetic recording hard disk drive. The component includes liquid crystal polymer. The component has an outgassing rate that is less than about 300 nanograms per gram.
Disclosed is the implementation of microstructured surfaces on electronic devices to increase the efficiency of two-phase immersion cooling of such electronic devices. The microstructures are adapted to inhibit vapor blanket formation at the device surface during heat transfer to a dielectric cooling fluid by promoting formation and release of vapor bubbles in the dielectric cooling fluid that are roughly an order of magnitude smaller than vapor bubbles formed in the absence of the microstructures.
Methods that facilitate the movement of droplets in a digital microfluidic process, such as a lab-on-a-chip system. The methods also allow for a decrease in the minimum droplet size, allowing for the use of smaller fluid droplets in the microfluidic processes. An oscillation or vibration device, such as a piezo-electric device, is used to produce an oscillation in the lab-on-a-chip that disturbs the fluid droplet, allowing easier and better movement of droplets, which allows use of smaller droplets.
A data storage medium includes a cobalt-based ferromagnetic recording layer, a non-magnetic substrate, and a magnetocaloric material. The magnetocaloric material is disposed between the recording layer and the substrate, wherein the magnetocaloric material is configured to generate heat upon exposure to a magnetic field that causes a phase change in the magnetocaloric material. A method of writing data onto a data storage medium includes applying a magnetic field to the data storage medium at a write location from a write head, wherein the data storage medium includes a cobalt-based ferromagnetic recording layer, a non-magnetic substrate, and a magnetocaloric material disposed between the recording layer and the substrate. The method includes transferring heat from the magnetocaloric material to the recording layer; moving the write location out of the magnetic field, wherein the phase change is reversed; and absorbing heat from the recording layer by the magnetocaloric material.
G11B 5/66 - Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers
G11B 5/00 - Recording by magnetisation or demagnetisation of a record carrierReproducing by magnetic meansRecord carriers therefor
G11B 5/012 - Recording on, or reproducing or erasing from, magnetic disks
G11B 5/667 - Record carriers characterised by the selection of the material comprising only the magnetic material without bonding agent the record carriers consisting of several layers including a soft magnetic layer
77.
Optical magnetic recording system, writer, media, and method
Described are optical magnetic recording systems, writers, media, and methods that utilize pulses of electromagnetic radiation to deterministically record information on magnetic storage media unaided by any additionally applied magnetic field such as from a write pole. The recording pulses may be linearly (or longitudinally) polarized pulses or circularly polarized pulses. The pulses may be modulated in accordance with data bits to be written on the media. Modulation may include modulating the polarization state(s) of the pulses and/or modulating the amplitude(s) the pulses, depending on the particular construction or configuration of the magnetic storage media to be used. Described are recording systems and methods that include laser light pulse generation, light pulse modulation, light pulse delivery, and magnetic media constructions.
G11B 11/105 - Recording on, or reproducing from, the same record carrier wherein for these two operations the methods or means are covered by different main groups of groups or by different subgroups of group Record carriers therefor using recording by magnetisation or demagnetisation using a beam of light or a magnetic field for recording and a beam of light for reproducing, e.g. light-induced thermomagnetic recording or Kerr effect reproducing
G11B 5/00 - Recording by magnetisation or demagnetisation of a record carrierReproducing by magnetic meansRecord carriers therefor
G11B 5/02 - Recording, reproducing or erasing methodsRead, write or erase circuits therefor
A data storage device includes a data storage disk, an actuator arm, a load beam attached to the actuator arm, and a flexure attached to the load beam. The disk has a read/write surface defining an x-y plane, and the actuator arm is movable parallel to the x-y plane. The load beam supports a slider that carries a head that is configured to interact with the read/write surface. The load beam includes a first dimple that extends toward the read/write surface and has a flat base. The flexure is attached to the load beam at the flat base of the first dimple and is attached to the slider. The flexure is substantially parallel to the x-y plane between the flat base of the dimple and the slider. In another aspect, an actuator arm assembly includes a load beam with weld dimples.
Described are electrodeposition methods, and materials and structures prepared by electrodeposition methods, and devices prepared from the electrodeposited materials.
Provided are devices and methods for reading data from rotating ferroelectric data storage media using a reader that includes a channel region disposed between a source and a drain. The data bits, stored as dipoles in the ferroelectric media, induce a current flowing through the channel region of the reader from the source to the drain when a bias voltage is applied to the media. The bias voltage can be tuned for desired reader operation, such as enhancing the signal or operating within a linear response regime.
G11B 9/02 - Recording or reproducing using a method or means not covered by one of the main groups Record carriers therefor using ferroelectric record carriersRecord carriers therefor
82.
Hard disk drive with dynamically designated media zones for archiving and performance
Described are data storage systems and methods in which data ingested by a hard disk drive (HDD) may be first stored in a designated intake zone of the HDD magnetic media using conventional performance parameters and recording techniques, and thereafter compacted and moved to a designated high-density zone on the magnetic media. The compacted data is stored at higher data storage densities than what is convention, and at lower performance parameters, and thus the moving of compacted data to the high-density zone may be done opportunistically in the background. The intake zone and high-density zone may be statically designated or dynamically defined based on HDD performance requirements, usage characteristics, available media capacity, and so forth.
Described are adsorption filters for filtering hydrocarbon cooling oils. The adsorption filters include a molecular sieve composite mixture that combines at least two filter materials that each have a surface chemistry and/or a pore size distribution that is selected to target the preferential adsorption of contaminants present or expected to be present in the hydrocarbon cooling oils, for example from oxidation of the oils, from electronic components immersed in the oils for cooling, or from other environmental factors. At least one of the filter materials may be an alkali metal aluminosilicate molecular sieve.
Described are systems and methods for vibrational analysis of ultrasonic motors. These include the use of a quadrature oscillator circuit configured to produce a dual signal output that includes two sinusoidal waves separated by a non-zero phase shift of 90 degrees or less. The ultrasonic motor is configured for simultaneous excitation of a bending mode and an expanding mode in response to the dual signal output from the quadrature oscillator. A laser doppler vibrometer is used to analyze the ultrasonic motor being operated under simultaneous bending mode and expanding mode excitation.
An electronic cooling system includes an enclosure in which an electronic component is removably housed. A non-conductive liquid immerses or wets the electronic component. A foam heat sink is attached to a heat emitting surface of the electronic component. The foam heat sink is immersed or wetted by the liquid and provides a heat transfer path between the electronic component and the liquid. A porosity of the foam heat sink increases a coolant heat absorption rate from the heat emitting surface to the fluid.
09 - Scientific and electric apparatus and instruments
Goods & Services
Data storage devices, namely, hard disk drives, solid state drives, digital disk drives, hard drives with solid state memory; Blank digital storage media and hybrid drives; Electronic data storage devices, namely, networked storage drives; Computer hardware for upload, storage, retrieval, download, transmission and delivery of digital content; Computer storage devices, namely, computer memory hardware and hard drives for computers; Computer storage devices, namely, configurable data storage systems comprised of redundant and non-redundant drive arrays; Computer backup and storage systems with multiple removable redundant and non-redundant drive arrays; Redundant and non-redundant drive array based computer backup systems; Removable hard drive based computer backup systems; Computer network-attached storage (NAS) hardware; Computer hardware that provides real-time analytics on data usage patterns and data usage workloads for improving enterprise storage performance and capacity; External storage devices in the nature of external computer disk drives that wirelessly communicate with handheld computers, tablet computers, notebook computers, laptop computers, mobile electronic devices, cell phones, smart phones, MP3 devices; Wireless data storage devices, namely, hard disk drives; Downloadable computer software for use in the synchronization, back-up, playing and encryption and decryption of digital files, including audio, video, text, binary, still images, graphics and multimedia files; Downloadable computer firmware for data storage, data retrieval, data access, data backup, data replication, data availability, data recovery, data translation and data conversion; Downloadable software for organization and management of data in distributed computer storage systems; Downloadable software for data encryption; Downloadable software for backing up encrypted data files; Downloadable software for accessing and restoring data files; Downloadable software for downloading computer files over a network; Downloadable software for uploading computer files over a network; Downloadable software for file management; Downloadable software for allowing computer files to be shared by others; Downloadable software for creating and maintaining a virtual file server distributed over a network; Downloadable software for creating and maintaining a distributed file system; Downloadable computer software for managing, securing and operating network-attached data storage systems; Downloadable software for storing, accessing and managing data and multimedia content on computer network; Downloadable computer software for synchronizing local computer files, folders, data and information with a cloud storage platform; Downloadable data storage computer software for use with and incorporated into computer storage devices; Downloadable software for data storage management; Downloadable software for processing and storage of data utilizing drive arrays; Downloadable computer software for use in imaging, duplicating and restoring the original factory level instances of hard disk drive, for use in preserving and restoring software programs and information in a computer, for use in performing diagnostics on hard disk drives, for use in connection with computer disk drives for the storage, backup and retrieval of information, for use in connection with data storage, data management and interconnection, and management and operation of data storage devices, for use in back-up of computer hard drive data, back-up of computer networks, and data recovery; Downloadable software for providing streaming video over a network; Downloadable computer software designed to encode and decode data; Downloadable software for publishing data and allowing access to data; Downloadable data search software
87.
SYNTHESIS AND STORAGE OF DNA HAVING ATTACHED NANOSTRUCTURE
Using a nanostructure as a support structure for DNA, particular for binary data-encoding DNA, both during the writing or assembly step and during long-term storage. The nanostructure may be a nanoparticle, such as a magnetic nanoparticle (MNP), e.g., a silica-based MNP. The nanostructure serves as a carrier for DNA storage due to the high-aspect-ratio surface area of the nanostructure, which enables high-density DNA immobilization on the surfaces. When silica nanostructures are used, DNA encapsulated within the silica endures exposure to high temperatures, oxygen radicals, and ultraviolet light without significant damage, thus, supporting long term storage of the DNA. Magnetic nanostructures facilitate, via magnetic separation, buffer exchanges and removal of unligated strands.
A first set of components (e.g., recording head components) is formed on a first wafer at a first pattern density. A second set of components is formed on a second wafer at a second pattern density that is less than half that of the first pattern density. The first and second sets of components are joined to form respective subassemblies (e.g., recording head subassemblies).
Described are systems, devices and methods for staggered bits magnetic recording. A staggered bits track pattern is recorded on granular magnetic recording media, thereby mapping a data bit sequence onto adjacent tracks so that the bits in one track are staggered relative to the bits in the adjacent track. A read head having an effective cross-track width extending across the tracks is aligned to read a sequence of combined bit signals as the read head is advanced in the down-track direction. Each combined bit signal combines one bit from each adjacent track. A data channel coupled to the read head is used to disambiguate the sequence of combined bit signals, thereby reproducing the data bit sequence.
Disclosed are storage devices and methods relating to reading staggered bits recording patterns in which the data bits on adjacent tracks recorded on magnetic media are staggered in such a way that a single reader detects a combined signal from data bits on multiple tracks at selected signal sampling locations. A signal shaping algorithm is used to deconvolve the combine signals, thus isolating each of the tracks from one another so that single track bit sequences can be decoded. In this way, staggered bits patterns can use intertrack interference effects for advantage, allowing readers to read multiple bit tracks simultaneously and without ambiguity.
Described are optical recording media for recording data in voxels, the optical recording media including a plurality of data recording regions for recording the voxels, the data recording regions separated by buffer regions having optical properties such that illumination from a reader that enters one of the data recording regions remains preferentially confined in said one of the data recording regions until being scattered by interaction with one or more of the voxels. Also described are methods for reading the described optical recording media, which include separating the light received from illuminating the voxels based on wavelength, polarization, or other optical properties.
G11B 7/00 - Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation, reproducing using an optical beam at lower powerRecord carriers therefor
G11B 7/013 - Arrangement of the information on the record carrier, e.g. form of tracks for discrete information, i.e. where each information unit is stored in a distinct location
G11B 7/24044 - Recording layers for storing optical interference patterns, e.g. hologramsRecording layers for storing data in three dimensions, e.g. volume storage
G11B 7/24067 - Combinations of two or more layers with specific interrelation
92.
Wear leveling and grouping of drives based on position in chassis
A processor may determine, for each subdevice of a set of subdevices of a storage enclosure device, one or more reliability measures of the subdevice. A processor may determine, based at least on the one or more reliability measures for the subdevices and a spatial layout rule, a set of striping groups that maximizes a reliability of the set of subdevices of the storage enclosure device, each of the striping groups including a respective subset of the set of subdevices, wherein the spatial layout rule prescribes a geometric layout of the subdevices within striping groups across the storage enclosure device. A processor may store output data of a data striping operation to a particular subset of subdevices associated with a particular striping group of the set of striping groups.
A recording head includes a near-field transducer proximate a media-facing surface of the recording head. A light delivery waveguide extends from an energy source to the near-field transducer. The light delivery waveguide includes, proximate the near-field transducer, a C-shaped core of a first dielectric material. The C-shaped core has a hollow aligned with the near-field transducer. A cladding of a second dielectric material surrounds the C-shaped core.
A heat-assisted magnetic recording head includes a near-field transducer, a waveguide, and a solid immersion mirror. The near-field transducer is configured to focus and emit an optical near-field. The waveguide is configured to receive electromagnetic radiation and propagate the electromagnetic radiation toward and proximal to the near-field transducer. The solid immersion mirror is disposed proximal to the near-field transducer and along a media-facing surface of the heat-assisted magnetic recording head. The solid immersion mirror includes a first segment and a second segment disposed on opposite sides of the near-field transducer relative to a cross-track dimension of the heat-assisted magnetic recording head. The solid immersion mirror includes a thermally robust metal having a melting temperature of at least 1500 degrees Celsius. The thermally robust metal is a primary material of the solid immersion mirror.
Described are magnetic recording heads that include auxiliary current wires that drive the write pole tip, augmenting the main coils that provide magnetomotive force to the write pole. The auxiliary wires are provided in close proximity to the write pole tip near the media-facing surface of the recording head, and are preferably in closer proximity to the write pole tip than are the main coils. In certain writer designs that include one or more heat sink structures positioned near or around the write pole tip, such as may be found in heat-assisted magnetic recording writer constructions, the auxiliary wire(s) may be accommodated near or around the heat sink structures, or the heat sink structures themselves can serve as the auxiliary wires.
Fasteners such as stainless-steel screws used to physically couple at least one component within a housing of a data storage device such as a hard disk drive to secure the at least one component within the housing. The fasteners are made by first pre-treating the fasteners to form sufficient metal oxide prior to coating the fasteners in one or more lubricants.
Provided are arrangements of optical elements that combine the features of a high power, compact laser that exhibits narrow linewidth output and that does not appreciably shift in wavelength or vary in power over a wide range of temperatures. Such arrangements include a transmission filter and a Bragg reflector that select out the wavelength for which the output power of a reflective semiconductor optical amplifier (RSOA) is least affected by changes in temperature over a temperature range of interest. Such arrangements may also utilize temperature-insensitive materials.
G11B 7/126 - Circuits, methods or arrangements for laser control or stabilisation
G11B 5/00 - Recording by magnetisation or demagnetisation of a record carrierReproducing by magnetic meansRecord carriers therefor
G11B 13/08 - Recording simultaneously or selectively by methods or means covered by different main groupsRecord carriers thereforReproducing simultaneously or selectively therefrom using near-field interactions or transducing means and at least one other method or means for recording or reproducing
H01S 5/026 - Monolithically integrated components, e.g. waveguides, monitoring photo-detectors or drivers
Provided are systems, methods and configurations for high-bandwidth co-packaged optical assemblies designed to allow optical modules to be plugged directly into the optical package via slots in the front fascia panel, thus providing for field-replaceability and serviceability of the optical modules while ensuring close electronic connectivity.
A hard disk drive (HDD) includes a heat-assisted magnetic recording (HAMR) head. The HAMR head includes one or more features comprising a laser device that is a heterogeneous integrated epitaxial grown GaAS laser. The laser device couples directly with a waveguide that transfers the electromagnetic radiation generated by the laser device to a near field transducer. The device includes an N-doped layer for coupling the output of the GaAs active layer to the waveguide.
G02B 6/10 - Light guidesStructural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
G11B 5/00 - Recording by magnetisation or demagnetisation of a record carrierReproducing by magnetic meansRecord carriers therefor
G11B 5/31 - Structure or manufacture of heads, e.g. inductive using thin film
100.
High-density archival storage using conventional hard disk drive architecture
Described are hard disk drives (HDDs) operable for archival applications and utilizing the same mechanical and electrical design of conventional HDDs. The capacity of a conventional HDD may be extended by up to 25% to 40% or more by employing multiple write and/or read spins before declaring success in write and read processes. The multiple write and/or read spins are designed to address the lower reliability that would otherwise result from high density packing of the data, at the cost of reducing performance. The result is an HDD with lower performance at higher capacity without sacrificing reliability and without altering conventional HDD mechanical or electrical design.
