Patents Examined by Peter Vincent Agustin
  • Data storage device independently driving outer and inner fine actuators
    Patent number: 11482246
    Abstract: A data storage device is disclosed comprising a plurality of disks each comprising a top disk surface and a bottom disk surface. A plurality of inner actuator arms each comprise a first inner fine actuator configured to actuate a top head over one of the top disk surfaces and a second inner fine actuator configured to actuate a bottom head over one of the bottom disk surfaces. A first outer actuator arm comprises a first outer fine actuator configure to actuate a top head over a top disk surface of a top disk, and a second outer actuator arm comprises a second outer fine actuator configured to actuate a bottom head over a bottom disk surface of a bottom disk, wherein the inner fine actuators are controlled independent from the outer fine actuators.
    Type: Grant
    Filed: February 15, 2021
    Date of Patent: October 25, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Yanning Liu, Jaesoo Byoun
  • Data storage device independently driving outer and inner fine actuators
    Patent number: 11482254
    Abstract: Control circuitry is disclosed configured to control inner fine actuators of a first plurality of inner actuator arms and independently control a first outer fine actuator of a first outer actuator arm. Inner fine actuators of a second plurality of inner actuator arms are controlled while independently controlling a second outer fine actuator of a second outer actuator arm. Each actuator arm comprises at least one head configured to access a disk surface of a disk.
    Type: Grant
    Filed: August 6, 2021
    Date of Patent: October 25, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Manoj Keshavan, Yanning Liu, Hitoshi Shindo, Siddhesh V. Sakhalkar
  • Synchronous writing of patterned media
    Patent number: 11475912
    Abstract: Systems and methods are disclosed for synchronous writing of a grain patterned medium. The systems and methods can be implemented within a data storage device having a grain patterned medium. Further, a calibration process to determine a count of bits between servo wedges can be implemented in manufacturing, within the data storage device, or both. In some examples, the data storage device, during operation, can utilize the count of bits to perform synchronous writing, determine write errors, or both. Further, the servo wedge of the grain patterned medium may be patterned with a same or similar grain pattern as the data area that follows the servo wedge. Such a data storage device can implement a single clock for reading a servo wedge and writing a data area.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: October 18, 2022
    Assignee: Seagate Technology LLC
    Inventors: Jason Bellorado, Marcus Marrow, Zheng Wu
  • Magnetic disk device
    Patent number: 11456016
    Abstract: According to one embodiment, a magnetic disk device includes a plurality of magnetic disks, a plurality of magnetic heads provided correspondingly to the plurality of magnetic disks and configured to carry out read/write of data from/to the magnetic disks, and a control section configured to, when the magnetic head is in a second status before the magnetic head enters the first status, change setting in such a manner as to change a first memory area of a magnetic disk corresponding to the magnetic head in the second status among memory areas constituted of the plurality of magnetic disks to a second memory area in which a write count is limited.
    Type: Grant
    Filed: September 8, 2021
    Date of Patent: September 27, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Masaki Obuchi
  • Repeatable runout compensation value generation
    Patent number: 11456014
    Abstract: Generating a hard disk drive (HDD) data track repeatable runout (RRO) compensation value for a target track involves querying at least one RRO table for a closest track to the target track external servo target (EST) and identifying an ESTx corresponding to the closest track, computing a first absolute value of the difference between the EST and the ESTx, and responsive to the first absolute value being less than an approximation threshold, setting the RRO compensation value for the target track to the RRO compensation value for the closest track. Else, querying the RRO table(s) for each adjacent track to the target track, computing the difference between the ESTs for the adjacent tracks, and responsive to the second absolute value being less than an interpolation threshold, determining an RRO compensation value for the target track based on RRO compensation values corresponding to the adjacent tracks.
    Type: Grant
    Filed: October 5, 2021
    Date of Patent: September 27, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Zaifeng Chen, Chuanwen Ji
  • Derivation device, derivation method, derivation program, and magnetic tape
    Patent number: 11456015
    Abstract: A derivation device is a device that derives a reading path by a reading element in a case where plural pieces of data to be read are read from a recording medium, and includes a first derivation unit that derives a value representing a recording density of the data for each of plural areas in which the plural pieces of the data to be read are recorded, and a second derivation unit that derives a path for sequentially reading the data as the reading path for an area in which the value representing the recording density is equal to or larger than a predetermined threshold value and derives the reading path according to a predetermined path determination method for an area in which the value representing the recording density is less than the threshold value.
    Type: Grant
    Filed: August 24, 2021
    Date of Patent: September 27, 2022
    Assignee: FUJIFILM CORPORATION
    Inventor: Michitaka Kondo
  • Data group playback device and system and method for same
    Patent number: 11450347
    Abstract: The present invention provides an apparatus, system and method for reproducing data in groups. According to the apparatus, system and method for reproducing data in groups, some piece of data of sound source data that is already being reproduced through a specific terminal or external speaker is input through a microphone and compared with the entire data of the sound source data, thus to identify a current reproduction point, and synchronize the reproduction point with sound source data being played externally, thereby reproducing the sound source data at the same time.
    Type: Grant
    Filed: April 9, 2020
    Date of Patent: September 20, 2022
    Assignee: MUSICMOB CO., LTD.
    Inventors: Heon-Joo Jun, Mi-Soon Kim
  • Reducing time to reposition tape to write index
    Patent number: 11437062
    Abstract: Aspects of the present disclosure relate to a method for reducing repositioning time within tape systems. A request to reposition to a target file within a tape medium can be received. A determination can be made that a previous command issued to the tape system was a write and that an index corresponding to the write has not been written. In response to determining that the previous command was the write and that the index corresponding to the write has not been written, a first file mark, the index after the first file mark, and a second file mark after the index can be written.
    Type: Grant
    Filed: August 23, 2021
    Date of Patent: September 6, 2022
    Assignee: International Business Machines Corporation
    Inventors: Tsuyoshi Miyamura, Tohru Hasegawa, Noriko Yamamoto, Atsushi Abe, Hiroshi Itagaki, Shinsuke Mitsuma
  • Multi-session concurrent testing for multi-actuator drive
    Patent number: 11437071
    Abstract: A method for testing a multiple-actuator storage device includes accessing a first storage device comprising at least a first and a second logical unit and concurrently performing a first group of test operations on the first logical unit and a second group of test operations on the second logical unit. The method includes monitoring for an interruption during the performing the group of test operations on the first or the second logical unit, and during the monitoring, if it is determined that there is an interruption on one of the first or second logical units, performing the respective test operations on the other logical unit is temporarily suspended. The method also includes continuing to monitor for the interruption, and upon determining that the interruption is not currently active, resuming concurrently performing the test operations on the first and second logical units.
    Type: Grant
    Filed: August 26, 2019
    Date of Patent: September 6, 2022
    Assignee: Seagate Technology LLC
    Inventors: Fabian Tang Kok Meng, Zhixing Chen, Song Liqin
  • Heat-assisted magnetic recording (HAMR) medium with optical-coupling multilayer between the recording layer and heat-sink layer
    Patent number: 11437064
    Abstract: A heat-assisted magnetic recording (HAMR) disk has a magnetic recording layer (typically a FePt chemically-ordered alloy), a seed-thermal barrier layer (typically MgO) below the recording layer, a heat-sink layer, and an optical-coupling multilayer of alternating plasmonic and non-plasmonic materials between the heat-sink layer and the seed-thermal barrier layer. Unlike a heat sink layer, the multilayer has very low in-plane and out-of-plane thermal conductivity and thus does not function as a heat sink layer. The multilayer's low thermal conductivity allows the multilayer to also function as a thermal barrier. Due to the plasmonic materials in the multilayer it provides excellent optical coupling with the near-field transducer (NFT) of the HAMR disk drive.
    Type: Grant
    Filed: August 6, 2021
    Date of Patent: September 6, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Pierre-Olivier Jubert, Paul Christopher Dorsey, Hoan Cong Ho
  • Data storage device detecting NFT contamination by measuring thermal gradient and magnetic write width
    Patent number: 11430482
    Abstract: A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write element, a read element, a laser, and a near field transducer. An operating thermal gradient of the magnetic media is periodically measured at an operating power setting for the laser that achieves a target magnetic write width. When a slope of the operating thermal gradient exceeds a threshold, a test thermal gradient and magnetic write width of the magnetic media is measured at multiple power settings for the laser in order to detect a contamination of the near field transducer.
    Type: Grant
    Filed: June 24, 2021
    Date of Patent: August 30, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Sukumar Rajauria, Robert Lee Smith, Taiebeh Tahmasebi
  • Triple magnet linear actuator motor
    Patent number: 11430472
    Abstract: A data storage device includes a ferromagnetic center pole, a drive coil for an actuator arm assembly, and a magnetic assembly surrounding the drive coil. The drive coil surrounds the center pole and has a top, a bottom, and first and second sides; the first side is attached to the actuator arm assembly. The magnetic assembly includes a top magnet disposed above and spaced from the center pole, a bottom magnet disposed below and spaced from the center pole, and a side magnet disposed proximate the second side of the coil and spaced from the center pole. In another embodiment, a linear actuator comprises a ferromagnetic center pole, a drive coil supported for linear motion on a rail, and a magnetic assembly. A method including linearly moving a drive coil along a center pole by a magnetic field is also described.
    Type: Grant
    Filed: November 17, 2021
    Date of Patent: August 30, 2022
    Assignee: Seagate Technology LLC
    Inventors: YiChao Ma, Xiong Liu, Gordon Harwood, Yongjie Tang
  • Data storage device interleave driving secondary actuators
    Patent number: 11423931
    Abstract: A data storage device is disclosed comprising a plurality of disks each comprising a top disk surface and a bottom disk surface, and a plurality of actuator arms each comprising a first fine actuator configured to actuate a top head over one of the top disk surfaces and a second fine actuator configured to actuate a bottom head over one of the bottom disk surfaces. A first fine driver controls the fine actuators of an even interleave of the actuator arms, and a second fine driver controls the fine actuators of an odd interleave of the actuator arms.
    Type: Grant
    Filed: February 21, 2021
    Date of Patent: August 23, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Kevin Tzou, Robert C. Reinhart, Hitoshi Shindo, Shigenori Takada
  • Write timing for RRO field in a constant density servo system
    Patent number: 11417361
    Abstract: A method for writing repeatable run-out data, representing a recurring contribution to position error, to a rotating constant-density magnetic storage medium, includes repeating, for each respective track at a respective radius of the constant-density magnetic storage medium, (1) determining a respective track pattern frequency based on track location and desired data density, (2) locating a position in a respective servo wedge on the respective track based on servo sync mark detection, (3) writing the repeatable run-out data to the respective servo wedge at a time delay, from the location of the position in the respective servo wedge, that is inversely proportional to the respective radius, to achieve a predetermined offset, and (4) repeating the determining, the locating and the writing for each servo wedge on the respective track of the constant-density magnetic storage medium.
    Type: Grant
    Filed: August 17, 2021
    Date of Patent: August 16, 2022
    Assignee: Marvell Asia Pte, Ltd.
    Inventor: Supaket Katchmart
  • Measuring amplitudes of written tracks in a tape drive to determine errors in read and write elements in the tape drive
    Patent number: 11404078
    Abstract: Provided are a tape drive, tape drive controller, and method for measuring amplitudes of written tracks to determine errors in read and write elements. The write element writes a data pattern and erase pattern to the tape medium to provide the data pattern and the erase pattern on sides of the data pattern. The read element is positioned to measure amplitudes at offsets in the data pattern. The offsets and the amplitudes at the offsets are processed to estimate a maximum amplitude read while the read element is estimated to be positioned entirely in the data pattern and estimate an offset at which the read element reads a fixed percentage of the maximum amplitude. A width of the read element is estimated based on the estimated offset. The estimated width of the read element is outputted to determine whether the estimated width of the read element is acceptable.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: August 2, 2022
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: David Lee Swanson, Ernest Stewart Gale, Josephine Faith Bayang (Kubista), Illarion Borisevich
  • Magnetic disk device
    Patent number: 11404084
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head configured to write data on the magnetic disk, an assist section configured to assist, when the magnetic head writes data on the magnetic disk, write of the data by utilizing an assist element, a voltage control section configured to control a voltage to be applied to the assist element, and a positioning control section configured to carry out positioning of the magnetic head relatively to the magnetic disk on the basis of servo data and acquire positional error data of the magnetic head positioned on the basis of the servo data. The voltage control section adjusts the voltage to be applied to the assist element on the basis of the positional error data.
    Type: Grant
    Filed: January 29, 2021
    Date of Patent: August 2, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Gaku Koizumi
  • Optimized dual thermal fly-height design for dual writers for advanced magnetic recording
    Patent number: 11404080
    Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a first write head and a second write head each coupled to a first pad and a second pad of a slider pad and an electrical circuit coupled to the first and second pads. The first write head is a wide writing write head, and the second write head a narrow writing write head. The electrical circuit comprises a first sub-circuit and a second sub-circuit connected in parallel. The first sub-circuit comprises a capacitor and a connection to a first thermal fly height control (TFC) of the first write head. The second sub-circuit comprises an inductor and a connection to a second TFC of the second write head. The electrical circuit is further connected to a third TFC of a read head, the second write head comprising the read head.
    Type: Grant
    Filed: July 20, 2021
    Date of Patent: August 2, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventors: Quang Le, Jih-Shiuan Luo, Thao A. Nguyen, Kuok San Ho
  • Noncontact communication medium, magnetic tape cartridge, operation method of noncontact communication medium, and storage medium
    Patent number: 11398249
    Abstract: A noncontact communication medium includes a coil and a processor mounted on a magnetic tape cartridge. The processor communicates with a communicatee by coupling between the coil and the communicatee by electromagnetic induction through an external magnetic field applied from the communicatee. The communicatee merges a command into the external magnetic field. The processor executes processing corresponding to the command merged into the external magnetic field. The processor changes a response time of the processor in response to the command, according to a characteristic of at least one of the magnetic tape cartridge, the noncontact communication medium, or the communicatee.
    Type: Grant
    Filed: February 1, 2021
    Date of Patent: July 26, 2022
    Assignee: FUJIFILM CORPORATION
    Inventor: Eiichiro Kataoka
  • Magnetic tape device, magnetic tape, and magnetic tape cartridge
    Patent number: 11393503
    Abstract: A magnetic tape device, in which a magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, and the magnetic tape after running in a state where the tension is applied is caused to be wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction of the magnetic tape, and an adhesive strength of the magnetic layer of the magnetic tape is 1.0 N or more, and an adhesive strength of the back coating layer is 1.0 N or more.
    Type: Grant
    Filed: May 27, 2021
    Date of Patent: July 19, 2022
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Magnetic disk device and track setting method
    Patent number: 11393500
    Abstract: According to one embodiment, a magnetic disk device includes a disk, a head, and a controller that sets at least a set of a first target position and a second target position to be matched, among a plurality of the first target positions respectively corresponding to a plurality of first tracks in a case where writing on the first tracks is performed to the first region of the disk in a radial direction of the disk under a first recording mode, and a plurality of the second target positions respectively corresponding to a plurality of second tracks in a case where writing on the second tracks is performed to the first region in the radial direction under a second recording mode different from the first recording mode.
    Type: Grant
    Filed: August 11, 2021
    Date of Patent: July 19, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Kazuto Kashiwagi, Bunpei Ishiguro, Kazuhito Shimomura