Patents Examined by Nabil Hindi
  • Patent number: 10025534
    Abstract: Implementations disclosed herein include a method comprising receiving a TRIM request for a media cache in a storage media from a host, determining whether a TRIM range in the TRIM request overlaps with an active operation, invalidating the TRIM range responsive to determining that the TRIM range does not overlap with an active operation, and inserting at least one null node in the media cache. The method may comprise receiving a host read request, performing a media cache search for a read LBA range, and determining where data is located. If all the data is located in the media cache, the system reads from the media cache. If the data is located in a null node, patterning for the null node occurs. If the data is located partially in the main store, the media cache, or a null node, the data may be read, combined, and returned to the host.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: July 17, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Yan Naing, Harry Tiotantra, PohGuat Bay, Thein Than Zaw, CheeHou Peng
  • Patent number: 10026441
    Abstract: The present disclosure relates to a method and apparatus for processing of multi-dimensional readback signal from magnetic recording or optical, physical data recording so as to reduce/control Inter Symbol Interference (ISI) and noise within acceptable limits. The method is based on Partial Response Maximum Likelihood (PRML) detection and takes care of time varying channel conditions. In an embodiment, the filter coefficients of both the equalizer and the partial response (PR) target are jointly adapted to account for the channel condition for both separable and non-separable targets thus reducing signal detection complexity. In an aspect, the disclosure provides an apparatus that incorporates an adaptation engine along with the equalizer and the PR target that updates filter coefficients of both the equalizer and the PR target following the formulated mathematical equations.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: July 17, 2018
    Assignee: INDIAN INSTITUTE OF SCIENCE
    Inventors: Shayan Srinivasa Garani, Chaitanya Kumar Matcha, Arnab Dey
  • Patent number: 10020012
    Abstract: First and second servo control processors are coupled to respective first and second actuators that independently position first and second heads over one or more disks of a data storage drive. The first and second servo control processors are further coupled to first and second low-latency ports. First and second unidirectional buses couple the first and second low-latency ports. The first and second unidirectional busses are operable to isochronously exchange servo positioning data between the first and second servo control processors. The first and second servo control processors each use the servo positioning data to compensate for movement caused by another of the first and second servo control processors.
    Type: Grant
    Filed: October 31, 2017
    Date of Patent: July 10, 2018
    Assignee: Seagate Technology LLC
    Inventors: Aaron P. Weyer, Bruce Douglas Buch, Kyaw Sin Maung, Jon D. Trantham, Nicholas Paul Mati
  • Patent number: 10014025
    Abstract: A tape layout module for determining a tape layout allocation strategy for laying out data on tape, the data being organized into a plurality of fixed-size subdata sets with each of the plurality of subdata sets including a plurality of codeword interleaves, the tape including a plurality of media defect characteristics, includes a tape layout optimization system including a processor that receives information on the plurality of media defect characteristics. The tape layout optimization system determines the tape layout allocation strategy based at least in part on at least one of the plurality of media defect characteristics. Additionally, the tape layout optimization system can determine the tape layout allocation strategy further based on distance spectra between pairs of the plurality of codeword interleaves. Further, the tape layout optimization system can determine the tape layout allocation strategy by selectively utilizing at least one tape layout parameter.
    Type: Grant
    Filed: July 20, 2017
    Date of Patent: July 3, 2018
    Assignee: QUANTUM CORPORATION
    Inventors: Suayb S. Arslan, Turguy Goker, Jaewook Lee, Hoa Le
  • Patent number: 10013204
    Abstract: A method for writing data from a table to a tape includes setting a number of partitions on the tape, where the number of partitions is greater than or equal to a number of columns of the table to be written to the tape, and writing data from each column of the table to at least one partition of the tape, the at least one partition including two or more wraps, the data is written from a top of the two or more wraps towards a bottom of the two or more wraps in a direction of a width of the at least one partition. The written data is reciprocated from a beginning of the tape to an end of the tape in a longitudinal direction of the tape such that writing of a last data entry of one column ends at a beginning of the two or more wraps.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: July 3, 2018
    Assignee: International Business Machines Corporation
    Inventors: Kousei Kawamura, Koichi Masuda, Sosuke Matsui, Yutaka Oishi, Takahiro Tsuda
  • Patent number: 10008226
    Abstract: A method and system for adjusting a servo head in a tape drive is disclosed. Position information for the servo head can be obtained and used to determine if an adjustment of one of the servo heads is necessary. By comparing the position of the tape against two servo heads, erroneous adjustments to the servo head can be obviated.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: June 26, 2018
    Assignee: International Business Machines Corporation
    Inventors: Nhan X. Bui, Tsuyoshi Miyamura, Eiji Ogura, Tomoko Taketomi, Kazuhiro Tsuruta
  • Patent number: 10008228
    Abstract: In a storage device, data is written to tracks on a storage medium. Data for each track includes a preamble. The preamble in any current track is orthogonal to the preamble in any track adjacent to the current track. A first read head is positioned over the current track and off-center toward a first adjacent track on a first side of the current track to detect first signals from among the current track, the first adjacent track, and a second adjacent track on a second side of the current track. A second read head is positioned over the current track and off-center relative to the current track toward the second adjacent track to detect second signals from among the current track, the first adjacent track, and the second adjacent track. Analyzing the first and second signals determines an amount by which the read heads are off-track from the current track.
    Type: Grant
    Filed: June 14, 2017
    Date of Patent: June 26, 2018
    Assignee: Marvell International Ltd.
    Inventor: Nitin Nangare
  • Patent number: 10002630
    Abstract: An apparatus includes a frequency analyzer circuitry, filter circuitry, and voice coil motor (VCM) control circuitry. The frequency analyzer circuitry is configured to detect one or more dominant frequencies of a position error signal (PES). The filter circuitry is configured to identify one or more filters in response to detecting the one or more dominant frequencies, apply the one or more identified filters to at least one of a microactuator control signal and PES, and generate a VCM compensation signal in response to the filtered PES or the microactuator control signal. The VCM control circuitry is configured to generate a VCM control signal in response to the VCM compensation signal.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: June 19, 2018
    Assignee: Seagate Technology LLC
    Inventors: Hoang Dung Vu, Xiang Lu, GuoQing Zhang, Chan Fan Lau
  • Patent number: 10002631
    Abstract: An apparatus comprising a slider and a detector coupled to the slider. The slider is configured for writing data to and reading data from a magnetic recording medium. The slider comprises a heater configured to receive a modulated signal and cause oscillation in a spacing between the slider and the medium. At least one heat generating component of the slider is configured to receive a modulated signal. A contact sensor is situated on the slider to receive heat generated by the at least one heat generating component. The detector is configured to measure a response signal of the heated contact sensor as the slider approaches the medium. The detector is further configured to detect contact between the slider and the medium in response to the response signal reaching a predetermined threshold.
    Type: Grant
    Filed: June 23, 2017
    Date of Patent: June 19, 2018
    Assignee: Seagate Technology LLC
    Inventors: James Dillon Kiely, Zhen Wei, Neil Zuckerman, John Charles Duda, Eric L. Montei
  • Patent number: 10002639
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for sanitizing audio recordings. One of the methods includes identifying confidential information in a transcription of an audio file. The method includes altering at least a portion of the audio file to remove the identified confidential information.
    Type: Grant
    Filed: June 12, 2017
    Date of Patent: June 19, 2018
    Assignee: United Services Automobile Association (USAA)
    Inventors: Michael Joseph Gaeta, Michael Jay Szentes
  • Patent number: 9997193
    Abstract: A drive-implemented method according to one embodiment includes determining that unthreading of a tape is to be performed, and in response to the determination that the unthreading of the tape is to be performed, determining whether to write an index on the tape prior to unthreading the tape. In response to a determination to write the index on the tape, the index is written on the tape prior to unthreading the tape. The tape is then unthreaded.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: June 12, 2018
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Masayuki Iwanaga, Yutaka Oishi
  • Patent number: 9997176
    Abstract: A recording medium is written to using an energy source that heats the medium during the writing. A read error in a sector is determined when reading via a read transducer. While traversing a part of the recording medium that includes data, a write coil is activated before attempting to re-read the sector. The energy source does not heat the recording medium sufficiently to change a state of the data during the activation of the write coil. The activation of the write coil removes a magnetic instability of the read transducer.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: June 12, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Wenzhong Zhu, Jason C. Jury, Alfredo Sam Chu
  • Patent number: 9997187
    Abstract: An optical information recording apparatus and method thereof for recording information in a holographic medium. The apparatus includes a laser source which generates a reference beam and a signal beam to record the information in the holographic medium, a sensor which detects a vibrational amplitude over a time period applied to the optical information processing apparatus for recording the information, an operational circuit which calculates from the vibrational amplitude at least one statistical measure of the vibrational amplitude; and a processor programmed to control a recording mode such that the processor evaluates the calculated statistical measure to determine continuation of a recording operation to the holographic medium.
    Type: Grant
    Filed: August 15, 2014
    Date of Patent: June 12, 2018
    Assignees: THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIVERSITY OF ARIZONA, HITACHI, LTD.
    Inventors: Toshiki Ishii, Yuzuru Takashima
  • Patent number: 9990953
    Abstract: Systems and methods for long-term non-volatile non-rotating optical storage of digital information rely on storage elements that include optical storage media, an access subsystem configured to access bits of information from one of the storage elements, and a support structure configured to support multiple storage elements. A laser used to retrieve and/or record bits of digital information may be moved along two orthogonal dimensions while the storage element is non-rotating.
    Type: Grant
    Filed: August 11, 2017
    Date of Patent: June 5, 2018
    Inventor: Jasmin Ajanovic
  • Patent number: 9990947
    Abstract: A slider of a heat-assisted recording head comprises electrical bond pads coupled to bias sources and a ground pad, an air bearing surface, and a waveguide configured to receive light from a laser source. A contact sensor proximate the air bearing surface is coupled between a first bond pad and a second bond pad. A bolometer is coupled to a reference thermal sensor. The bolometer is situated at a slider location that receives at least some of the light communicated along the waveguide. The reference thermal sensor is situated at a slider location unexposed to the light communicated along the waveguide. The bolometer and reference thermal sensor are coupled between the first and second bond pads and in parallel with the contact sensor. A ground connection is coupled to the ground pad and at a connection between the bolometer and the reference thermal sensor.
    Type: Grant
    Filed: October 20, 2017
    Date of Patent: June 5, 2018
    Assignee: Seagate Technology LLC
    Inventors: Declan Macken, Jon Karsten Klarqvist
  • Patent number: 9990141
    Abstract: A storage control device configured to control a storage device includes a memory and a processor coupled to the memory and configured to receive a request of writing of data from an information processing device, assign a unit memory area in the storage device in response to the request of writing, determine whether a sequential format processing is to be executed on the unit memory area based on continuity of logical addresses designated by the request of writing, and determine a timing to execute the sequential format processing on the unit memory area based on a number of commands per unit time to the storage device when the sequential format processing is determined to be executed on the unit memory area.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: June 5, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Chikashi Maeda, Yukari Tsuchiyama, Takeshi Watanabe, Guangyu Zhou
  • Patent number: 9984714
    Abstract: An apparatus including a heat sink layer and a magnetic recording layer over the heat sink layer. In addition, a thermochromic layer is over the heat sink layer, wherein the thermochromic layer includes a first optical absorbance at a first temperature and a second optical absorbance at a second temperature.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: May 29, 2018
    Assignee: Seagate Technology LLC
    Inventors: Paul M. Jones, Timothy J. Klemmer, Ruoxi Yang, Martin Giles Blaber, Xiaoding Ma, ZhaoHui Fan, Michael J. Stirniman, Yang Yang, XiaoPing Yan, Fujian Huang, Emil John Catoc Esmenda, Emir R. Kazazic, Florin Zavaliche, Hongbo Wang, Huan H. Tang, Kyoumarss Damavandi
  • Patent number: 9978401
    Abstract: Systems and methods for a providing a chirped current profile with an undershoot for a channel preamplifier are described. A method for writing bits in a magnetic recording disc may include applying an overshoot to a write current which is supplied to a magnetic writer of the magnetic recording disc and applying an undershoot to the write current after the overshoot is applied to at least partially de-saturate the magnetic writer. The method may also include writing a bit to the magnetic recording disc with the magnetic writer using the supplied write current. In some examples, the application of a short negative pulse after an overshoot portion of the write current waveform is delivered to the head during a write operation that writes the bit to the magnetic recording disc.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: May 22, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Kirill A. Rivkin, Mourad Benakli, Todd M. Lammers, Ralph William Cross
  • Patent number: 9978403
    Abstract: Data is written to a recording medium via a read/write head. Subsequent to the writing, the data is read via a read transducer of a read/write head. An instability indicator is derived based on measurements performed while the reading the data. If the instability indicator exceeds a threshold, a current applied to a write coil of the read/write head is changed for subsequent write operations.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: May 22, 2018
    Assignee: Seagate Technology LLC
    Inventors: Wenzhong Zhu, Alfredo Sam Chu, Siew Kin Chow
  • Patent number: 9978416
    Abstract: A reproducing device (100) includes (i) an optical pickup (6) for irradiating, with reproduction light, an optical disk (1) which is a super-resolution medium, (ii) an RF signal processing circuit (9) for converting, into a reproduction signal, light which reflected off optical disk (1), (iii) an i-MLSE detecting section (141) for evaluating quality of the reproduction signal, and (iv) a spherical aberration correcting section (142) for correcting a spherical aberration by using a result of evaluation of the quality of the reproduction signal.
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: May 22, 2018
    Assignees: SHARP KABUSHIKI KAISHA, MEMORY-TECH HOLDINGS INC.
    Inventors: Hideharu Tajima, Masaki Yamamoto, Hirohisa Yamada, Takayuki Naka, Masahito Konishi