Abstract: The embodiments disclose an analyzer configured to determine positions of circumferential gratings track features and alignment patterns in a first template and a phase device configured to determine positions of radial gratings features and interspersed pattern fields in a second template, wherein the first template is transferred and cross-imprinted with the second template features and patterns to form a third template substrate as a rectangular patterned stack imprint template.

Abstract: Apparatus for providing skew compensation in a patterned medium, such as but not limited to a self-assembling bit patterned medium. In accordance with some embodiments, the apparatus includes a transducer and a rotatable substrate. The substrate has a plurality of rows of spaced apart data recording dots. Each row of dots is angularly offset from an immediately adjacent row responsive to a skew angle of the transducer. The rows of dots are arranged into concentric zones of hypertracks. Each zone has an arcuate timing field segment which extends across the zone and is angularly discontinuous with the timing field segment of an immediately adjacent zone.

Abstract: Apparatus and method for data security through the use of an encrypted keystore data structure. In accordance with some embodiments, first and second sets of input data are respectively encrypted using first and second encryption keys to form corresponding first and second encrypted data sets. The first and second encryption keys are combined to form a string. A hidden key stored within a system on chip (SOC) is used to encrypt the string to form an encrypted keystore data structure, and the first and second encrypted data sets and the encrypted keystore data structure are stored in a memory.

Abstract: Provided herein is an apparatus, including a first part of a data storage device and a second part of the data storage drive. The second part of the data storage device is fused to the first part substantially throughout opposing surfaces of the first part and the second part, where the opposing surfaces are in contact with each other.

Abstract: A device including a first axial portion, a second axial portion, and a radial portion is disclosed. A portion of the second axial portion is configured to connect to a hub. An upper surface of the second axial portion may be positioned above an upper surface of a sleeve limiter shoulder when the portion of the second axial portion is connected to the hub. The radial portion connects the first axial portion to the second axial portion. The radial portion is configured to increase stiffness by increasing surface contact between the radial portion and the sleeve limiter shoulder.

Abstract: A magnetic data storage drive that includes a self-assembled monolayer having a magnetic function. The drive comprises a magnetic data storage medium having a magnetic surface, a slider having a working surface, the slider positioned and configured to detect magnetic fields from the magnetic surface of the medium, and a self-assembled monolayer between the magnetic surface and the working surface, the self-assembled monolayer having a magnetic function to reduce dispersion of magnetic fields from the magnetic surface of the medium to the working surface of the slider.

Abstract: An apparatus having a nonvolatile memory and a controller. The memory stores information in multiple pages. The information includes data units and headers. Each data unit is associated with a respective identifier in an address space of the apparatus and a respective location in the memory, has a respective header having the respective identifier, and is associated with a respective time stamp. Multiple headers include ones of the time stamps. The controller is configured to (i) read information stored in the pages, (ii) determine an order in which the data units were written based on the time stamps, (iii) locate based on the order (a) each last-written occurrence of the respective identifiers and (b) the respective locations of the data units associated with the last-written occurrences, and (iv) rebuild a map of the controller according to the respective locations of each last-written occurrence of each respective identifier.

Abstract: A data storage device may be configured at least with an actuating assembly that has a head-gimbal suspension assembly (HGSA), first pivot point, and second pivot point. The head-gimbal assembly can be constructed and operated with at least first and second transducers aligned along a longitudinal axis of the head-gimbal suspension assembly. A controller may be adopted to manipulate the head-gimbal suspension assembly about at least one of the pivot points in response to a head-gimbal suspension assembly offset misalignment to compensate for such an offset.

Abstract: A memory device includes a stack of layers comprising a plurality of alternating layers of continuous electrically conductive material word line layers with layers of continuous electrically insulating material. A plurality of vias vertically extend through the stack of layers and a vertical bit line is disposed within each via. A layer of switching material separates the vertical bit line from the stack of layers, thereby forming an array of RRAM cells.

Abstract: A method for increasing performance of a recycle operation in a solid state drive, comprising the steps of (A) creating an empty physical-to-logical address map in a memory having a plurality of entry locations, (B) filling one of the plurality of entry locations with a physical page address associated with each data write operation to a block, where the block has a plurality of pages, (C) writing the physical-to-logical address map to a last of the plurality of pages during a write to a second to last page of the block and (D) initiating a recycle operation of the block by reading the address map to determine whether the pages contain valid data.

Abstract: Method and apparatus for managing a memory, such as but not limited to a flash memory. In accordance with some embodiments, initial state information is stored which identifies an actual state of a garbage collection unit (GCU) of a memory during a normal operational mode. During a restoration mode after a memory power cycle event, a virtualized state of the GCU is determined responsive to the initial state information and to data read from the GCU. The memory is transitioned from the restoration mode to the normal operational mode once the virtualized state for the GCU is determined.

Abstract: A base plate system including a base plate with first and second opposite surfaces, a boss tower extending from the first surface of the base plate and having an outer surface, a swaging hole extending through a height of the boss tower and a height of the base plate, and a relief channel recessed in the first surface of the base plate and extending around at least a portion of the outer surface of the boss tower, wherein the relief channel comprises a shape that is different from a shape of the outer surface of the boss tower.

Abstract: A circuit may be configured to reduce the power consumption and extend the life of a near field transducer of a heat-assisted magnetic recording (HAMR) device by pulsing a laser. The current that drives the laser may be of a frequency and magnitude so as to approximate the value of a continuous current in a continuous, non-pulsed laser. A system on chip (SOC), which may include a HAMR channel, can generate a laser data signal that may be synchronous with, and offset from, a write signal by a certain period of time, and may calculate certain parameters such as peak current and pulse width that may be applied to the signals in a preamp. The preamp signals can be used to program data to a disc medium.

Abstract: In accordance with one implementation of the described technology, an apparatus comprises a sensor structure including a top shield which includes a top shield synthetic antiferromagnetic layer and a bottom shield including a bottom shield synthetic antiferromagnetic layer, wherein the bottom synthetic antiferromagnetic shield layer acts as a seed layer structure.

Abstract: A read head includes a bottom shield configured as a bottom electrical contact. A bottom reader stack is disposed on and electrically coupled to the bottom shield. A middle electrical contact is electrically coupled to a top layer of the bottom reader stack. A top reader stack is disposed on the bottom reader stack. A bottom layer of the top reader stack electrically coupled to the middle electrical contact. A top shield is configured as a top electrical contact. The top shield is disposed on and electrically coupled to the top reader stack.

Abstract: A read head includes a bottom shield and a bottom isolation layer that electrically isolates the bottom shield. The read head includes left and right reader stacks having respective bottom layers disposed on at least a portion of the bottom isolation layer. The left and right reader stacks are cross-track adjacent to one another. The read head also includes left and right bottom contacts electrically coupled to respective left and right bottom layers. A top shield is configured as a common top contact electrically coupled to respective top layers of the left and right reader stacks.

Abstract: A method of adhering a magnetic layer to a plastic substrate of a magnetic recording medium, the method including depositing a SiN-containing layer on the plastic substrate and depositing a magnetic layer on the SiN-containing layer is disclosed. Also disclosed is a disc for a rotating recording system including a plastic substrate, a bilayer including a SiN-containing layer and a metal-containing layer on the plastic substrate, and magnetic media on the bilayer.

Abstract: In one example, an FDB motor having a shield member is provided. In one example, the method includes disposing a first member and a second member for relative rotation about an axis of rotation. An annular shield member is attached to the first member, the shield member disposed adjacent a fluid reservoir for containing a bearing fluid. The reservoir is filled through an aperture (e.g., a fill hole) in the shield member. Thereafter, the aperture is at least partially sealed. The aperture may be hermetically sealed via one or more laser pulses. In other examples, a two piece shield is provided for shielding a reservoir without a fill hole.

Abstract: Techniques using scalable storage devices represent a plurality of host-accessible storage devices as a single logical interface, conceptually aggregating storage implemented by the devices. A primary agent of the devices accepts storage requests from the host using a host-interface protocol, processing the requests internally and/or forwarding the requests as sub-requests to secondary agents of the storage devices using a peer-to-peer protocol. The secondary agents accept and process the sub-requests, and report sub-status information for each of the sub-requests to the primary agent and/or the host. The primary agent optionally accumulates the sub-statuses into an overall status for providing to the host. Peer-to-peer communication between the agents is optionally used to communicate redundancy information during host accesses and/or failure recoveries. Various failure recovery techniques reallocate storage, reassign agents, recover data via redundancy information, or any combination thereof.

Abstract: A material handling apparatus adapted to support a plurality of disc-shaped platters, such as but not limited to a cassette assembly adapted to support data recording media or substrates during manufacturing. In some embodiments, a cassette assembly includes a base cassette with a base and opposing sidewalls configured to support an outermost perimeter of each of a first plurality of disc-shaped platters having a first diameter. An insert contactingly engages the base cassette. The insert has a plurality of spaced apart grooves to contactingly support an outermost perimeter of each of a second plurality of disc-shaped platters having a different, second diameter.