Patents Examined by Nabil Hindi
  • Patent number: 10102869
    Abstract: According to one embodiment, a magnetic disk device including a disk, a head which reads data from the disk, a memory which records data, and a controller which includes a table, and records, at a first time point at which a read gate is open, a first area number of a first area of the table in which first information related to first data is recorded, a first serial number of the first data added when the read gate is open, and a first count value of the first data, in the first area.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: October 16, 2018
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Kazuya Takada, Kenji Yoshida
  • Patent number: 10096338
    Abstract: A data recording apparatus includes a disk, a read/write head, and a control circuit configured to control the head to perform reading of first data on the disk according to a first format and writing of second data to the disk according to a second format, wherein the second data is generated by compressing at least a part of the first data, and the second format is determined according to a data size of the second data.
    Type: Grant
    Filed: March 2, 2017
    Date of Patent: October 9, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Hasegawa, Kenji Yoshida
  • Patent number: 10096332
    Abstract: Implementations disclosed herein include a method to synthesize the controller of a multi-stage servo control system with multiple actuators in a hard disk drive by dividing controller synthesis into multiple dual-stage steps. The method includes measuring a first output of a first plant corresponding to a first actuator, measuring a second output of a second plant corresponding to a second actuator, designing a first controller responsive to the first output, designing a second controller responsive to the second output, and combining the first output and the second output to obtain a first combined output in a first dual-stage. The method also includes designing a third controller responsive to the first combined output, measuring a third output from a third plant corresponding to a third actuator, designing a fourth controller responsive to the third output, and combining the first combined output and the third output to obtain a second combined output.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: October 9, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Tzung-Sz Shen, Bin Huang, Raye Sosseh, Ying Qi
  • Patent number: 10084285
    Abstract: An example system may include a first vertical cavity surface emitting laser (VCSEL) that includes a first integrated polarization locking structure to produce a polarized optical data signal. The system may also comprise a second VCSEL that includes a second integrated polarization locking structure, the second integrated polarization locking structure orthogonal to the first integrated polarization locking structure, to produce an orthogonally polarized optical data signal. Lenses may be disposed on the substrate opposite the first VCSEL, to collimate the polarized optical data signal, and opposite the second VCSEL to collimate the orthogonally polarized optical data signal. A polarization division multiplexer may combine the first collimated polarized optical data signal and the second collimated orthogonally polarized optical data signal.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: September 25, 2018
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Binhao Wang, Wayne Sorin, Michael Tan, Sagi Mathai, Stanley Cheung
  • Patent number: 10083714
    Abstract: A magnetic disk device includes a magnetic disk that includes a plurality of tracks, a magnetic head for reading data from the magnetic disk, and a controller. The controller begins controlling the magnetic head to move to a second track of the plurality of tracks from a first track of the plurality of tracks before decoding of a first track signal output from the magnetic head is completed, wherein the first track signal is output from the magnetic head while the magnetic head is positioned over the first track.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: September 25, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Takashi Matsuo, Kenji Yoshida
  • Patent number: 10083711
    Abstract: A magnetic recording apparatus in an embodiment includes a magnetic head, a storage, a detector, and a controller. The magnetic head records data on a recording medium. The storage stores first current parameters defining a first current waveform, second current parameters defining a second current waveform, and recording bit sequence information. The detector detects a discontinuity point from the recording bit sequence information. The discontinuity point is defined by a position at which recording bit lengths are discontinuous. The controller controls a waveform of a recording current of the magnetic head, based on the first current parameters at a recording bit that is not next to the discontinuity point and based on the second current parameters at a recording bit that is next to the discontinuity point.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: September 25, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yousuke Isowaki, Katsuya Sugawara
  • Patent number: 10079038
    Abstract: An optical disc device includes: an optical disc drive that reads data from a plurality of optical discs in which user data is recorded while distributed in the plurality of optical discs; a memory unit in which data read from an optical disc of a first group that is a part of the plurality of optical discs is recorded through the optical disc drive; and a controller that reproduces the user data from data of a remaining optical disc except for the first group, the data of the remaining optical disc being read through the optical disc drive, and the data recorded in the memory unit.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: September 18, 2018
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Yoshikazu Yamamoto, Yoshihisa Takahashi, Atsushi Kiyomura
  • Patent number: 10079032
    Abstract: A combination of a semiconductor member and a metal member is selected appropriately from a view point of increasing an enhancement factor of a near-field light. A device (1) has a semiconductor member (101) and a metal member (102), a near-field light is generated at the metal member when an energy is supplied to the semiconductor member, the metal member is made of an alloy including a first metal and a second metal, a condition of Rm1<Rs<Rm2 is satisfied, wherein a resonance wavelength of the first metal is Rm1, a resonance wavelength of the second metal is Rm2, and a resonance wavelength of the semiconductor member is Rs.
    Type: Grant
    Filed: June 6, 2014
    Date of Patent: September 18, 2018
    Assignees: INNOVASTELLA CO., LTD, SCHOOL JURIDICAL PERSON OF FUKUOKA KOGYO DAIGAKU
    Inventors: Ryuichi Katayama, Katsumi Yoshizawa, Satoshi Sugiura, Takayuki Kasuya
  • Patent number: 10079033
    Abstract: Systems and techniques for compensation to improve write signal controls for magnetic-medium-based storage devices, include an apparatus comprising: pre-compensation circuitry coupled with a controller to receive a data signal and a write-current control signal and to generate a write-current signal; the pre-compensation circuitry is configured to use different baseline write-current levels for the write-current signal after an overshoot write-current level used at polarity transitions of the write-current signal, and the pre-compensation circuitry is configured use a first baseline level of the different baseline write-current levels for a first type of magnet in the sequence of magnets and use a second baseline level of the different baseline write-current levels for a second type of magnet in the sequence of magnets, the first baseline level having a greater magnitude than the second baseline level, and the first type of magnet being shorter than the second type of magnet.
    Type: Grant
    Filed: January 25, 2018
    Date of Patent: September 18, 2018
    Assignee: Marvell International Ltd.
    Inventor: Mats Oberg
  • Patent number: 10073123
    Abstract: Systems and techniques relating to voltage signal peak level detection used in sensor devices, namely in Fly-Height Sensors (FHS) devices include, according to an aspect, an integrated chip device comprising: peak detection circuitry configured to receive a voltage signal and output a peak voltage signal associated with a peak voltage level of the voltage signal, wherein the peak detection circuitry comprises: a linear loop section configured to store the peak voltage level and hold additional voltage levels of the voltage signal at an output terminal of an amplifier to a value greater than zero; and a feedback loop section configured to reduce a leakage current within the peak detection circuitry and generate a guard voltage signal usable to reduce a feedback voltage and prevent the feedback voltage from successively re-entering into the feedback loop section.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: September 11, 2018
    Assignee: Marvell International Ltd.
    Inventor: Xiao Yu Miao
  • Patent number: 10067707
    Abstract: System and method are disclosed for managing storage space of a magnetic storage device. The system may read data from a first sector of the storage space and determine whether the data are successfully read from the first sector. The system may write updated data to the first sector and a second sector when it is determined that the data are not successfully read from the first sector.
    Type: Grant
    Filed: November 30, 2015
    Date of Patent: September 4, 2018
    Assignee: ALIBABA GROUP HOLDING LIMITED
    Inventors: Shu Li, Wei Zou
  • Patent number: 10068593
    Abstract: A slider configured for heat-assisted magnetic recording has an upper surface, an opposing air bearing surface (ABS), and a body defined between the upper surface and the ABS. The slider comprises a write pole and a near-field transducer (NFT) at or near the ABS. An optical waveguide is configured to receive light from a laser source and comprises a first cladding layer, a second cladding layer, and a core between the first and second cladding layers. The core has a width, a length, and a longitudinal axis oriented along the length of the core. A bolometer is situated within the body of the slider at a location that receives at least some of the light communicated along the waveguide used during a writing operation. The bolometer is spaced apart from the core and comprises a longitudinal axis that is oriented substantially parallel to the longitudinal axis of the core.
    Type: Grant
    Filed: January 10, 2018
    Date of Patent: September 4, 2018
    Assignee: Seagate Technology LLC
    Inventors: James Gary Wessel, Chen Wang
  • Patent number: 10068609
    Abstract: In some implementations, a system includes a magnetic media disk and a read/write unit. The read/write unit includes a plurality of phase-locked loops (PLLs), an interpolator unit, a delay-locked loop, and a precompensation unit. The PLLs are configured to generate, using a reference clock signal, a first plurality of clock signals having different frequencies phases. The interpolator unit is configured to interpolate the first plurality of clock signals in accordance with a frequency offset signal to generate a single-phase clock signal. The delay-locked loop is configured to delay the single-phase clock signal in accordance with a PLL data clock signal to generate a second plurality of clock signals having different phases. The precompensation unit is configured to apply precompensation to the second plurality of clock signals to generate a timing signal for writing data to the magnetic media disk.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: September 4, 2018
    Assignee: Marvell International Ltd.
    Inventors: Ahmed Hesham Mostafa, Zubir Adal
  • Patent number: 10068608
    Abstract: Systems and methods are disclosed for applying multi-stage multiple input single output (MISO) circuits for fast adaptation. An apparatus may comprise a first reader and a second reader configured to simultaneously read from a single track of a data storage medium, a MISO circuit. The MISO circuit may include a first stage filter having a first number of taps and configured to filter signal samples received from the first reader and the second reader and produce first filtered samples. The MISO circuit may also include a second stage filter having a second number of taps greater than the first number, and be configured to receive the first filtered samples corresponding to the first reader and the second reader from the first filter stage, filter the first filtered samples to produce second filtered samples, and combine the second filtered samples to produce a combined sample output.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: September 4, 2018
    Assignee: Seagate Technology LLC
    Inventors: Marcus Marrow, Jason Bellorado, Zheng Wu
  • Patent number: 10068597
    Abstract: First tracks of a disk are read via a first read transducer. The first read transducer has a first crosstrack width and a first shield-to-shield spacing that are optimized to read a first track width and a first linear bit density of the first tracks. Second tracks interlaced between the first tracks are read via a second read transducer. The second read transducer has a second crosstrack width different from the first crosstrack width and second shield-to-shield spacing different than the first shield-to-shield spacing. The second crosstrack width and the second shield-to-shield spacing are optimized to read a second track width different from the first track width and a second linear bit density different from the first linear bit density.
    Type: Grant
    Filed: January 17, 2018
    Date of Patent: September 4, 2018
    Assignee: Seagate Technology LLC
    Inventors: Jason Charles Jury, Steven Douglas Granz
  • Patent number: 10062407
    Abstract: A precompensation circuit can include: a rising edge interpolator circuit configured to generate a phase shifted rising edge data signal; a falling edge interpolator circuit configured to generate a phase shifted falling edge data signal; a multiplexer circuit coupled with the rising edge interpolator circuit and with the falling edge interpolator circuit to multiplex the phase shifted rising edge data signal and the phase shifted falling edge data signal into an output data signal responsive to a select signal; and a control circuit coupled with the select input of the multiplexer circuit to control production of the output data signal, wherein the control circuit is further coupled with both the rising edge interpolator circuit and the falling edge interpolator circuit to change the select signal to the multiplexer circuit at times determined by both the phase shifted rising edge data signal and the phase shifted falling edge data signal.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: August 28, 2018
    Assignee: Marvell International Ltd.
    Inventors: Myung Jae Yoo, Ahmed Hesham Mostafa, Zubir Adal
  • Patent number: 10061088
    Abstract: A first waveguide portion receives light from an energy source in a fundamental transverse electric (TE00) mode. A mode converter converts a portion of the light to higher-order transverse electric (TE10) mode. A second waveguide portion receives the light at the TE10 mode and delivers the light to a near-field transducer that heats a recording medium in response thereto. An optical spatial mode filter prevents remnant light in the TE00 mode from affecting the recording medium while passing the light at the TE10 mode.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: August 28, 2018
    Assignee: Seagate Technology LLC
    Inventor: Chubing Peng
  • Patent number: 10055289
    Abstract: In one embodiment, a system includes a controller and logic integrated with and/or executable by the controller. The logic is configured to cause data to be written to a first write section of a magnetic medium as a plurality of first codeword sets, and cause at least some of the data to be written to a rewrite section of the magnetic medium as one or more rewritten codeword sets. A length of at least one rewritten row stored to the rewrite section of the magnetic medium is greater than either a length of another rewritten row in the same rewritten codeword set and/or a length of at least one row in a codeword set stored to the first write section of the magnetic medium.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: August 21, 2018
    Assignee: International Business Machines Corporation
    Inventors: Roy D. Cideciyan, Simeon Furrer, Robert A. Hutchins, Keisuke Tanaka
  • Patent number: 10049691
    Abstract: In a disk drive apparatus, a first time period is determined, during which a first head driven by a first actuator will be performing a first disk access operation. A second time period is determined, during which a second head driven by a second actuator will be performing a second disk access operation. The first and second actuators are independently movable such that the first and second disk access operations are capable of being performed in parallel. If it is determined that the second disk access operation will impact servo control of the first disk access operation, at least one of the first and second disk access operations is changed to reduce the impact to the servo control of the first disk access operation.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: August 14, 2018
    Assignee: Seagate Technology LLC
    Inventors: Mark Allen Gaertner, Vidur Fnu Parkash, Evgeny Kharisov, Josiah Natan Wernow
  • Patent number: 10049695
    Abstract: An optical pickup device includes a semiconductor laser that emits a laser beam, and an object lens that concentrates the laser beam emitted from the semiconductor laser on an optical disc. In this optical pickup device, an optical axis of the object lens is inclined with respect to an optical axis of the laser beam that is incident on the object lens so as to generate flares caused by coma aberration on an entrance side in a forward direction of pits of the optical disc.
    Type: Grant
    Filed: December 21, 2015
    Date of Patent: August 14, 2018
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Masatoshi Yajima, Kazuyoshi Kajita, Masahiko Nakamura