Abstract: Processes include aligning a disc with a template at a location so that the pattern from the template is transferred to the disc in a relative orientation. The relative orientation provides that when the disc with the transferred pattern is finally assembled into a hard disc drive, an inner diameter of the spindle hole of the disc may be abutted against an outer diameter of the disc drive spindle, and the data-containing patterns on the discs will be aligned concentrically with a center of the disc drive spindle. While the data-containing patterns are aligned concentrically with the disc drive spindle, the substrate itself is allowed to be non-concentric.

Abstract: A method for forming a transducing head having a magnetic writer includes forming a pedestal adjacent to a writer pole and a gap layer, depositing a front shield on the pedestal, etching the front shield, and depositing a backfill layer upon the front shield after etching. The front shield has a controlled thickness upon etching.

Abstract: For generating a seed, such as for a random number, a plurality of data storage location identifiers, such as sectors, can be combined. A random number can be calculated using the seed. The selection of the data storage location identifiers can be time varied based on commands received from a host. The seed that is generated can have enhanced unpredictability and complexity for secure data cryptography.

Abstract: A method and apparatus for adaptively controlling a motor considering a state of disturbance applied to a system. The method includes changing a frequency bandwidth of a frequency response characteristic in a motor control system according to a state of disturbance applied to the motor control system, and controlling a speed of the motor by applying the changed frequency bandwidth to the motor control system.

Abstract: Apparatus for two dimensional reading. In accordance with some embodiments, a magnetic read element has a bias magnet disposed between a plurality of read sensors. The bias magnet may be configured to concurrently bias each read sensor to a predetermined magnetization.

Abstract: The embodiments disclose a method of creating two-sided template from a single recorded master, including fabricating a first template using a single recorded master, wherein the first template has a changed duty cycle and an unchanged servo arc orientation, creating a replicate of the first template, wherein the replicate has a mirrored servo arc orientation and a changed duty cycle and fabricating a second template using the replicate to produce a predetermined mirrored servo arc orientation and a predetermined duty cycle for imprinting on a second side of a patterned stack.

Abstract: An apparatus includes a write pole, a waveguide adjacent to the write pole, the waveguide having a truncated end, and a blocking layer positioned adjacent the truncated end and extending from one side of the waveguide across a portion of an aperture at the truncated end. The waveguide can be a solid immersion mirror or a channel waveguide.

Abstract: An assembly and method to determine adjacent track coherence is disclosed. The assembly includes coherence circuitry configured to receive phase and frequency offsets from timing recovery circuitry and determine an inter-track phase and frequency coherence between the encoded data on a first track and the encoded data on a second track adjacent to the first track utilizing the frequency and phase offsets from the timing recovery circuitry for the output signals corresponding to the first and second tracks.

Abstract: A wafer article includes a substrate, two or more hydrophilic areas disposed on the substrate, hydrophobic areas surrounding the hydrophilic areas, and a eutectic bonding material disposed on the substrate. A wafer apparatus including two wafers having complimentary hydrophilic regions and eutectic bonding material is disclosed and a method of forming a bonded wafer articles is disclosed.

Abstract: Random numbers are generated using entropic properties associated with circuit hardware. Consistent with one method, a switching voltage regulator circuit is used to generate a random number. Data that is responsive to switching states of the switching voltage regulator circuit is generated. A multi-bit random number is then generated from the generated data.

Abstract: Vibration of a transducer slider can be used during slider fly height calibration to detect contact of the transducer slider with a disc surface. Amplification of the vibration may cause the transducer slider to tap the disc surface rather than drag across the disc surface when detecting contact with the disc surface. Amplification may be achieved by applying an in-phase AC signal to the transducer slider at the same frequency as the vibration of the slider. Reduced contact between the slider and the disc surface reduces wear on and the possibility of damage to the transducer slider and/or the disc surface. Once the fly height of the transducer slider is calibrated, the AC signal may be shifted out-of-phase with the slider vibration to dampen the slider vibration.

Abstract: Method and apparatus for managing data in a memory. In accordance with some embodiments, a control circuit monitors access operations upon a set of data blocks in a memory of a data storage device. The data blocks have a first logical address by which the data blocks are identified by a requestor coupled to the data storage device. When the monitored access operations indicate a potential data degradation condition may arise with the data blocks, the requestor assigns a different, second logical address to the data block.

Abstract: A playback device includes tangible storage configured to receive transfer of media content from a remote communications device to the playback device while the remote communications device is operating in a high power mode. Interface logic is coupled to the tangible storage and configured to signal the remote communications device during the transfer to prepare the remote communications device to enter a low power mode after the transfer is complete. The remote communications device includes a content manager configured to transfer of media content from the remote communications device to a playback device while the remote communications device is operating in a high power mode. Power logic is coupled to the content manager and configured to prepare the remote communications device to enter a low power mode after the transfer is complete, responsive to receipt of a signal from the playback device during the transfer is complete.

Abstract: A storage device is detected as being decoupled from an apparatus. At least one partition of the storage device is part of a storage volume that includes an array of separate storage devices in an initial configuration prior to being decoupled. In response to the storage device being recoupled to the apparatus, a universally unique identifier (UUID) of the storage device is detected. In response to determining the UUID of the storage device was previously associated with the storage volume, the storage volume is reconfigured/restored to include the at least one partition of the storage device in the initial configuration.

Abstract: A magnetic element is generally provided that can be implemented as a transducing head. Various embodiments may configure a magnetic stack having a magnetically free layer with a predetermined magnetization. A side shield lamination can be separated from the magnetic stack on an air hearing surface (ABS) and biased to a bias magnetization that opposes the predetermined magnetization.

Abstract: Apparatus for positioning a control object, such as a microactuator used to position a read/write transducer adjacent a data storage medium. In accordance with some embodiments, a piezoelectric transducer (PZT) element is adapted to induce rotational displacement of the control object in a bending mode of operation. The PZT element has a plurality of piezoelectric material layers and a plurality of electrically conductive layers interposed between the piezoelectric material layers. The piezoelectric material layers include a first subset of active layers and at least one non-active layer.

Abstract: Techniques for data recovery from a data block wherein portions of the data block are written at different off-track positions are described. For example, portions of a data block can be read separately for each on-track and off-track position in the data block; then, the separately read portions can be recombined into a recovered data block.

Abstract: An apparatus and method for storing data in a semiconductor memory. In accordance with some embodiments, the semiconductor memory has a continuous storage layer of soft ferromagnetic material having opposing top and bottom surfaces with overall length and width dimensions and an overall thickness dimension between the opposing top and bottom surfaces. A plurality of spaced apart, discrete reference layers are adjacent a selected one of the opposing top or bottom surfaces of the continuous storage layer with each having a fixed magnetic orientation. A plurality of spaced apart, discrete barrier layers are disposed in contacting relation between the discrete reference layers and the continuous storage layer.

Abstract: The variability of outer code failure rate of memory pages of a solid state memory device can be reduced by selectively grouping the pages included in the outer code words. The data in the page groups are encoded into outer code words which are stored in the memory device. Encoding the data of the page groups and storing the encoded data includes intermittently accumulating an outer code parity as the pages are sequentially stored in the memory device according to a particular order. The pages can be randomly selected for the page groups or can be grouped based on predicted or measured failure rate information. In a memory device having multi-level memory cells, predicting the failure rate of a page can be based on whether the page is a most significant bit (MSB) page or a least significant bit (LSB) page.