Abstract: Techniques for management of data storage in distributed storage systems are provided. A method may include receiving, by a computer system, a request to write data to a volume. The method may include identifying, by the computer system, a zone segment mapped to the volume. The zone segment may include a plurality of zones. The method may include identifying, by the computer system, a segment pointer indicating a write location in a zone of the zone segment. The method may include writing, by the computer system, the data to one or more zones of the plurality of zones of the zone segment, starting at the write location. The method may also include updating, by the computer system, the segment pointer according to a data endpoint of the data in the zone segment.

Abstract: A device and method of producing electrical energy by gravitomagnetic induction utilizing Nano-features fabricated on an object surface of an object is presented. The Nano-features may include Nano-bumps and Nano-pits. One device version includes a computer hard disk, a piezoelectric glide head, and/or a GMR read head, a prior art hard drive module electronics. By spinning the nano-features disk one produces an associated magnetic force utilizing a GMR read head for producing power by the presence or the absence of matter on an object that is in motion relative to the GMR read head. A computer system generated by the alternate computer system generates gravito-magnetic energy to power itself and/or other electrical or electronic devices, and/or, detects patterns of asperities or bump on a hard disk to generate binary value private keys applicable in asymmetric cryptography, such as public key cryptography.

Abstract: A data storage system includes a data storage foil mounted within the data storage system, the data storage foil has at least one data storage surface. The data storage system also includes a head configured to interact with the at least one data storage surface to carry out at least one of data read or data write operations.

Abstract: A hexagonal strontium ferrite powder, in which an average particle size is 10.0 to 25.0 nm, a content of one or more kinds of atom selected from the group consisting of a gallium atom, a scandium atom, an indium atom, and an antimony atom is 1.0 to 15.0 atom % with respect to 100.0 atom % of an iron atom, and a coercivity Hc is greater than 2,000 Oe and smaller than 4,000 Oe. A magnetic recording medium including: a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the ferromagnetic powder is the hexagonal strontium ferrite powder. A magnetic recording and reproducing apparatus including this magnetic recording medium.

Abstract: A textured enclosure component including two different types of surface features is disclosed. The two different types of surface features are differently sized. The combination of differently sized surface features provides both anti-glare and anti-reflective properties to the enclosure component.

Abstract: Mechanisms (such as systems, methods, and media) for protecting a client device from an insecure cloud-based storage container stored on a server are provided, the mechanisms comprising: determining that content accessible by the client device is hosted in a storage container on the server; sending a message to the server to determine what security provisions are in place for the storage container; determining that the storage container is not secure; and blocking access by the client device to the storage container.

Abstract: According to one embodiment, a magnetic disk device including a disk, a head, and a controller configured to, when writing a first servo sector, a second servo sector, and a third servo sector in the order described according to a second route varying in a radial direction of the disk with respect to a first route, adjust first timing used to write the second servo sector next to the first servo sector, and adjust second timing used to write the third servo sector next to the second servo sector.

Abstract: A method for storing data in groups of logical data sectors across a plurality of contiguous data tracks of a data storage medium includes defining a plurality of interleaver patterns, each interleaver pattern including a sector interleaving pattern specifying a respective order in which segments of respective ones of the logical data sectors are spread across physical data sectors of a respective one of the contiguous data tracks. For each respective group of logical data sectors, a respective interleaver pattern is selected. Data is written from each group of logical data sectors to one of the data tracks using the selected interleaver pattern. Each respective group of logical data sectors is written to its respective data track using a different interleaver pattern from any other group of logical data sectors written to an adjacent data track, so that no two adjacent data tracks are written using the same interleaver pattern.

Abstract: A processing device of a sequencer component can receive data from a controller that is external to the sequencer component. The processing device of the sequencer component can perform an error correction operation on the data received from the controller that is external to the sequencer component to generate a code word associated with the data. The code word can be stored at a memory component coupled with the sequencer component.

Abstract: A method of forming a patterned media includes constraining growth of magnetic grains in a down-track direction without constraining the growth in a radial direction to cause the magnetic grains to align in rows extending in the radial direction. The patterned media may allow for data track radial width to be defined independent of grain size.

Abstract: In a two-dimensional magnetic recording (TDMR) system, a first finite impulse response (FIR) filter processes data read from a track of a magnetic medium by a first head using first filter tap values determined a priori independently of a second head. A second FIR filter processes data read from a track by the second head using second filter tap values determined a priori independently of the first head. A read channel module generates an output based on outputs of the first and second FIR filters.

Abstract: Provided is a plurality of flaky magnetic metal particles of the embodiments, each flaky magnetic metal particle having a flat surface provided with either or both of a plurality of concavities and a plurality of convexities arranged in a first direction, each concavity or convexity having a width of 0.1 ?m or more, a length of 1 ?m or more, and an aspect ratio of 2 or higher; and at least one first element selected from the group consisting of iron (Fe), cobalt (Co), and nickel (Ni), the flaky magnetic metal particles having an average thickness of between 10 nm and 100 ?m inclusive and an average aspect ratio of between 5 and 10,000 inclusive.

Abstract: Compounds [compounds (L)] comprising at least one monocyclic, polycyclic or polycondensed aromatic moiety [moiety (A*)], wherein: at least one carbon atom of moiety (A*) is substituted with a fluoropolyoxyalkene chain [chain (Rf)], said chain (Rf) comprising: a) a fluorocarbon segment having ether linkages in the main chain and b) at least one hydroxyl group and wherein: at least one other carbon atom of moiety (A*) is substituted with an electron-withdrawing group and mixtures thereof are herein disclosed. Disclosed are also a process for manufacturing compounds (L), a method for lubricating MRM comprising using compounds (L), a lubricant composition comprising one or more compounds (L) and a method for manufacturing a composition (C).

Abstract: The present invention provides: an aluminum alloy substrate for magnetic discs with excellent plating surface smoothness; a manufacturing method therefor; and a magnetic disc using said aluminum alloy substrate for magnetic discs. The present invention is an aluminum alloy substrate for magnetic discs, a manufacturing method therefor, and a magnetic disc using said aluminum alloy substrate for magnetic discs, the aluminum alloy substrate being characterized in being obtained from an aluminum alloy containing Mg: 2.0-8.0 mass % (“%” below), Be: 0.00001-0.00200%, Cu: 0.003-0.150%, Zn: 0.05-0.60%, Cr: 0.010-0.300%, Si: 0.060% or less, Fe: 0.060% or less, the balance being obtained from Al and unavoidable impurities.

Abstract: According to one embodiment, a magnetic disk device includes a disk including two first servo sectors arranged side by side in a circumferential direction and a second servo sector located between the two first servo sectors, a head that writes data to the disk and reads data from the disk, and a controller that adjusts a second timing at which the second servo sector is demodulated based on a first timing at which the first servo sector is demodulated, and corrects a first initial phase of a first demodulation signal obtained by demodulating the second servo sector at the second timing, based on a first amplitude of the first demodulation signal.

Abstract: A technical object of the present invention is to devise a glass sheet that is suitable for supporting a substrate to be processed to be subjected to high-density wiring and has high end surface strength, and a method of manufacturing the glass sheet, to thereby contribute to an increase in density of a semiconductor package. The glass sheet of the present invention has a total thickness variation of less than 2.0 ?m, all or part of an end surface of the glass sheet including a melt-solidified surface.

Abstract: According to one embodiment, a magnetic disk device includes a disk, a first head, a second head, an actuator configured to position the first head and the second head over the disk, and a controller configured to control the actuator based on a first value having a first waveform suppressing a disturbance component, wherein the controller is configured to invert, in the first waveform, a polarity of a third waveform succeeding a first timing with respect to a polarity of a second waveform preceding the first timing in a case where the first head is changed to the second head at the first timing.

Abstract: A disk device includes a disk medium, a magnetic recording head, a processor configured to control the magnetic recording head to write data to and read data from a plurality of tracks of the disk medium on a sector-by-sector basis, and a check value generation circuit configured to generate, for each of the plurality of tracks, check value data based on data stored in one or more sectors of the track. The processor controls the magnetic recording head to write check value data for a first track of the plurality of tracks in a first sector on the disk medium and check value data for a second track of the plurality of tracks in a second sector on the disk medium that is adjacent to the first sector.

Abstract: An apparatus and method for topographically characterizing a workpiece. The method includes scanning a first surface of a workpiece with a scanning probe at a first resolution to derive a first topographical image, and performing a refining operation on the first topographical image to obtain a true first topographical image. The method also includes scanning, with the scanning probe, a surface of interest of the workpiece, which is a sub-portion of the first surface, at a second resolution that is higher than the first resolution to derive a second topographical image. The second topographical image is scaled down to the first resolution. The method further includes performing a pattern recognition operation to substantially match the scaled-down second topographical image to a corresponding sub-portion of the true first topographical image. The matched sub-portion of the true first topographical image is employed to refine the second topographical image.

Abstract: A magnetic-disk glass substrate of the present invention includes a pair of main surfaces, a side wall surface, and a chamfered surface between the main surfaces and the side wall surface. Regarding surface properties of at least one of the side wall surface and the chamfered surface of the glass substrate, an arithmetic average roughness (Ra) is 0.015 ?m or less, and a bearing factor of a roughness cross-sectional area when a roughness percentage is 60% is 95% or more in a bearing curve of a roughness cross-sectional area.

Abstract: Described are devices and assemblies (e.g., precursors to a devices) that include a friction stir weld or a joint useful for forming a friction stir weld, the devices containing two metal components that form the joint at which the friction stir weld can be produced, as well as methods for producing a devices, assembly, joints, or friction stir weld as described.

Abstract: The invention relates in particular to a method for producing subsequent patterns in an underlying layer (120), the method comprising at least one step of producing prior patterns in a carbon imprintable layer (110) on top of the underlying layer (120), the production of the prior patterns involving nanoimprinting of the imprintable layer (110) and leave in place a continuous layer formed by the imprintable layer (110) and covering the underlying layer (120), characterized in that it comprises the following step: at least one step of modifying the underlying layer (120) via ion implantation (421) in the underlying layer (120), the implantation (421) being carried out through the imprintable layer (110) comprising the subsequent patterns, the parameters of the implantation (421) being chosen in such a way as to form, in the underlying layer (120), implanted zones (122) and non-implanted zones, the non-implanted zones defining the subsequent patterns and having a geometry that is dependent on the prior patterns

Abstract: The magnetic tape device includes a magnetic tape and a TMR head (servo head), in which the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.

Abstract: In a two-dimensional magnetic recording (TDMR) system, a first finite impulse response (FIR) filter processes data read from a track of a magnetic medium by a first head using first filter tap values determined a priori independently of a second head. A second FIR filter processes data read from a track by the second head using second filter tap values determined a priori independently of the first head. An off-track detector detects whether one or more of the first and second heads is off of the tracks being read. A gain controller controls gains for the first and second FIR filters based on whether one or more of the first and second heads is off of the tracks being read.

Abstract: According to one embodiment, a magnetic disk device includes a disk, a first head, a second head, an actuator configured to position the first head and the second head over the disk, and a controller configured to control the actuator based on a first value having a first waveform suppressing a disturbance component, wherein the controller is configured to invert, in the first waveform, a polarity of a third waveform succeeding a first timing with respect to a polarity of a second waveform preceding the first timing in a case where the first head is changed to the second head at the first timing.

Abstract: A photovoltaic device includes an intrinsic layer having two or more sublayers. The sublayers are intentionally deposited to include complementary concave and convex shapes. The sum of these layers resulting in a relatively flat surface for deposition of n- or p-doped layers. The photovoltaic device is optionally bifacial.

Abstract: Methods, systems, and programs are presented for managing a storage device memory. One method includes an operation for receiving a request to pin a volume stored in the storage device. The device includes disk storage and a solid state drive (SSD) cache, where pinned volumes in the storage device have all active volume data in the SSD cache. Further, the method includes an operation for determining the maximum amount of pinnable space in the SSD cache, the maximum amount of pinnable space being calculated based on the sizes of the disk storage and the SSD cache. Further, the method includes operations for determining the available pinning space, which is the maximum amount of pinnable space minus the current amount of pinned data in the SSD cache, and for granting the request to pin the volume when the available pinning space is greater than or equal to a size of the volume.

Abstract: The present invention provides an audiovisual access criterion updating method, for updating an audiovisual access criterion in an audiovisual access criterion managing device, the audiovisual access criterion managing device managing the audiovisual access criterion of a content signal, the audiovisual access criterion updating method includes: a step of receiving update information descriptive of update content of the audiovisual access criterion and identification information of the audiovisual access criterion managing device by an updating code generating system; a step of generating an updating code by the updating code generating system according to the update information and the identification information; a step of receiving the updating code by the audiovisual access criterion managing device; and a step of updating the audiovisual access criterion by the audiovisual access criterion managing device according to the updating code.

Abstract: A drive pulley (12) is formed by a piston-cylinder mechanism in which a seal ring (15) is set on an outer periphery of a fixed piston plate (16) that is in sliding contact with a cylinder inner peripheral surface (12d) of a cylinder (12b), and is driven by being supplied with hydraulic pressure. As a control parameter of a surface roughness shape of the cylinder inner peripheral surface (12d) of the drive pulley (12), a kurtosis (Rku) of a roughness curve and a skewness (Rsk) of the roughness curve, each of which is a height direction characteristic average parameter, are used. The cylinder inner peripheral surface (12d) is set to a surface having a surface roughness shape whose measurement values of the kurtosis (Rku) and the skewness (Rsk) are predetermined respective control values or less. With this, it is possible to surely suppress sliding abrasion of the liquid-tight seal member.

Abstract: According to one embodiment, in a disk device, the head includes a first read element and a second read element. The disk medium is partitioned into a plurality of zones. The plurality of zones include a first zone and a second zone. The first zone includes a plurality of tracks on each of which a servo area and a data area are placed, a servo burst region in the servo area from which to detect the amount of off-track of the head from the center of a track, having a first bit length. The second zone includes a plurality of tracks on each of which a servo area and a data area are placed, a servo burst region in the servo area from which to detect the amount of off-track of the head from the center of a track, having a second bit length shorter than the first bit length.

Abstract: A thermally assisted magnetic recording head has a waveguide that propagates laser light as propagating light; a main pole that has a first end portion on an air bearing surface (ABS) facing a magnetic recording medium and that emits a magnetic flux to the magnetic recording medium; a metal layer that is positioned between the main pole and the waveguide, that extends from a second end portion positioned on the ABS in a height direction, that generates surface plasmons from the propagating light, and that generates near-field light (NF light) from the surface plasmons at the second end portion; and a dielectric body layer that is surrounded by the metal layer and that extends from a third end portion positioned on the ABS in a height direction.

Abstract: Narrow band dwell occurs when air bearings corresponding to a set of read and/or write heads within a hard disc drive remain within a fixed narrow band of one or more storage platters for an extended period of time. The air bearings displace lubricant on the storage platters and may redeposit the lubricant as droplets on the platters. The presently disclosure technology is directed to monitoring a hard disc drive for narrow band dwell, and in some implementations, implementing operations to mitigate narrow band dwell. More specifically, the presently disclosure technology may detect an overflying air-bearing slider position, apply a lubrication film displacement formula to a narrow band of the storage platter, apply a lubrication film reflow formula to one or more other narrow bands of the storage platter, and track lubrication film thickness over time in each of the narrow bands of the storage platter.

Abstract: The invention generally relates to hard disk drives with a disk and a read/write head, and methods for preventing contact between the disk and the read/write head. The hard disk drive includes a z-axis actuator configured to control movement of the read/write head, and to prevent contact between the read/write head and the disk, based on signals from a controller that indicate when the distance between the read/write head and the disk are outside a predetermined range, such as between 0 and 10.0 nm.

Abstract: Provided are an evaluation method of a magnetic tape, in which the magnetic tape which is an evaluation target includes a magnetic layer including a servo pattern, the method including: reading the servo pattern by a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element; measuring electric resistance of the tunnel magnetoresistance effect type element after the reading; and determining quality of the magnetic tape by using a degree of a decrease in the measured electric resistance from a reference value as an index, and a manufacturing method of a magnetic tape including: evaluating the magnetic tape including a servo pattern in a magnetic layer by the evaluation method.

Abstract: An optical recording medium includes a light-receiving surface that receives incident light and at least three information signal layers on which information signals are to be optically recorded. Among the at least three information signal layers, the information signal layer closest to the light-receiving surface has a reflectance in a range of 4% to 11%.

Abstract: Disclosed is a perpendicularly magnetized film structure that uses a highly heat resistant underlayer film on which a cubic or tetragonal perpendicularly magnetized film can grow with high quality, the structure comprising any one substrate (5) of a cubic single crystal substrate having a (001) plane, or a substrate having a cubic oriented film that grows to have the (001) plane; an underlayer (6) formed on the substrate (5) from a thin film of a metal having an hcp structure, such as Ru or Re, in which the [0001] direction of the thin metal film forms an angle in the range of 42° to 54° with respect to the <001> direction or the (001) orientation of the substrate (5); and a perpendicularly magnetized layer (7) located on the metal underlayer (6) and formed from a cubic material selected from the group consisting of a Co-based Heusler alloy, a cobalt-iron (CoFe) alloy having a bcc structure, and the like, as a constituent material, and grown to have the (001) plane.

Abstract: A lubricant including: an ionic liquid, which includes a conjugate acid (B+) and a conjugate base (X?), and is protic, wherein the ionic liquid is represented by the following general formula (1), and wherein the conjugate base is a conjugate base of sulfonic acid, a conjugate base of sulfonimide, or a conjugate base of trisulfonylmethide: where R1 and R2 each represent a hydrogen atom or R1 and R2 form a benzene ring together with carbon atoms to which R1 and R2 are bonded, R3 represents a to straight-chain hydrocarbon group having 10 or more carbon atoms, and R4 represents a hydrogen atom or a hydrocarbon group in the general formula (1).

Abstract: According to one embodiment, a glass article may include SiO2, Al2O3, Li2O and Na2O. The glass article may have a softening point less than or equal to about 810° C. The glass article may also have a high temperature CTE less than or equal to about 27×10?6/° C. The glass article may also be ion exchangeable such that the glass has a compressive stress greater than or equal to about 600 MPa and a depth of layer greater than or equal to about 25 ?m after ion exchange in a salt bath comprising KNO3 at a temperature in a range from about 390° C. to about 450° C. for less than or equal to approximately 15 hours.

Abstract: A lubricant, which includes an ionic liquid including a conjugate base and a conjugate acid, wherein the conjugate acid is represented by General Formula (A) below, and wherein a pKa of an acid that is a source of the conjugate base in acetonitrile is 10 or less, where, in General Formula (A), R1, R2, and R3 are each independently a group including a hydrocarbon group, with the proviso that at least one of the hydrocarbon groups in R1, R2, and R3 is a straight-chain hydrocarbon group having 6 or greater carbon atoms.

Abstract: Devices and methods for receiving a data file in a communication system. In one embodiment, the wireless communication device includes a transceiver, a memory, and an electronic processor. The transceiver is configured to send and receive data over a wireless communication network. The electronic processor is electrically coupled to the transceiver and the memory and configured to receive, with the transceiver, a first seed, a sequence of blocks, and a subsequent seed, cause the memory to save the sequence of blocks in the memory, and determine whether the subsequent seed is aligned with the first seed. When the subsequent seed is not aligned with the first seed, the electronic processor is configured to cause the memory to delete the sequence of blocks. When the subsequent seed is aligned with the first seed, the electronic processor is configured to cause the memory to maintain the sequence of blocks.

Abstract: A magnetic recording medium for heat assisted magnetic recording (HAMR) including in ascending vertical sequence: (i) a substrate; (ii) a first amorphous layer, a first seed layer, or a combination thereof; (iii) a heat sink layer comprising hexagonal boron-nitride grains; (iv) an optional second amorphous layer; (v) an optional second seed layer; (vi) a magnetic recording layer; (vii) an optional capping layer; and (viii) an optional overcoat layer; wherein: the magnetic recording medium has a substrate plane and a basal plane perpendicular to the substrate plane; the heat sink layer is anisotropic and has an a-axis thermal conductivity in the basal plane and a c-axis thermal conductivity in the substrate plane, wherein the a-axis thermal conductivity is greater than the c-axis thermal conductivity; and the hexagonal boron-nitride grains have an average size of at least about 10 nm in the substrate plane. Also, provided is a method of manufacturing the magnetic recording medium for HAMR.

Abstract: Provided are a power failure protection method and solid state drive (SSD). The SSD comprises: a power-failure detection device, for monitoring in real time whether the power supply is abnormal; a power-failure protection device performs a power-failure protection operation when the power supply is monitored to be abnormal: breaking a connection with a host system bus, an SSD internal clock breaking from a system bus clock and writing data in the SSD cache into a storage unit of the SSD by using the SSD internal clock. The technical solution ensures completion of the data protection operations by utilizing a remaining capacity, thus ensuring data integrity.

Abstract: A lubricant including an ionic liquid, which includes a conjugate acid (B+) and a conjugate base (X?), and is protic, wherein the conjugate acid includes a straight-chain hydrocarbon group having 10 or more carbon atoms, and wherein the conjugate base is represented by the following general formula (1): where n is an integer of from 0 to 6 in the general formula (1).

Abstract: An optical power level applied via a laser when recording data to a track of a heat-assisted recording medium is determined. In response to the optical power level being too low or too high, remedial action is taken to prevent loss of data on one or more of the track and an adjacent track.

Abstract: An optical recording medium includes a plurality of information signal layers on which information signals are to be optically recorded. Among the plurality of information signal layers, the information signal layer closest to the light-receiving surface has a reflectance of more than 4%.

Abstract: A method of testing anti-high temperature performance of a magnetic head comprises applying a plurality of second magnetic fields with different intensities in a second direction to the magnetic head, and measuring a second output parameter curve, and judging whether a variation that is beyond an allowable value is presented on the second output parameter curve, therein the second direction passes through the ABS and at an angle whose absolute value is an acute angle to the ABS. The present invention can screen out defective magnetic heads that possess poor anti-high temperature performance without heating the magnetic head.

Abstract: Image forming apparatus 1 that shortens warm-up time is provided. Accordingly, image forming apparatus 1 is an asymmetrical multiprocessing configuration provided with auxiliary memory part 21 shared between main control part 10 and sub control part 11. Use area 300 is an area accessed by main control part 10. Use area 301 is an area accessed by sub control part 11. Use area specifying part 100 specifies for use area 300 and use area specifying part 101 specifies for use area 301, respectively, by use area specifying table 210. Defective area table making part 110 makes defective area table 200 by searching whether or not a defective area only for use area 300 and set as a defective area for the other area. Defective area table making part 111 makes defective area table 201 by searching use area 301, similarly, and set as the defective area for the other area.

Abstract: A stack includes a substrate, a magnetic recording layer comprising FePtX disposed over the substrate, and a capping layer disposed on the magnetic recording layer. The capping layer comprises Co; at least one rare earth element; one or more elements selected from a group consisting of Fe and Pt; and an amorphizing agent comprising one to three elements selected from a group consisting of B, Zr, Ta, Cr, Nb, W, V, and Mo.

Abstract: A magnetic-disk glass substrate of the present invention includes a pair of main surfaces, a side wall surface, and a chamfered surface between the main surfaces and the side wall surface. Regarding surface properties of at least one of the side wall surface and the chamfered surface of the glass substrate, an arithmetic average roughness (Ra) is 0.015 ?m or less, and a bearing factor of a roughness cross-sectional area when a roughness percentage is 60% is 95% or more in a bearing curve of a roughness cross-sectional area.

Abstract: A perpendicular magnetic recording medium is disclosed in which crystal axis orientation dispersion, crystal grain diameter, and crystal grain diameter dispersion in a magnetic recording layer are reduced. The perpendicular magnetic recording medium has a structure having, stacked sequentially on a non-magnetic substrate, at least an amorphous underlayer, a lower orientation control layer made of Ru or Ru alloy of an hcp structure, an upper orientation control layer that is made of alloy containing an element selected from the group consisting of Co and Ni and an element selected from the group consisting of Cr, W, and Mo and that has an fcc or hcp structure, an intermediate layer, and a magnetic recording layer.