Controlling The Head Patents (Class 360/75)
  • Patent number: 11830524
    Abstract: Various illustrative aspects are directed to a data storage device, comprising: one or more disks; an actuating mechanism comprising one or more heads, and configured to position the one or more heads proximate to disk surfaces of the one or more disks; and one or more processing devices. The one or more processing devices are configured to: determine a first burst value based on an averaged value of a first set of one or more bursts; determine a second burst value based on an averaged value of a second set of one or more bursts; generate a position error signal (PES) based on the determined first burst value and the determined second burst value; and control a position of at least one head among the one or more heads based on the PES.
    Type: Grant
    Filed: June 13, 2022
    Date of Patent: November 28, 2023
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC
    Inventors: Kei Yasuna, Guoxiao Guo, Ichiro Yokokawa
  • Patent number: 11817137
    Abstract: The present disclosure generally relates to a tape drive including a tape head. The tape head comprises one or more modules, each module comprising a plurality of writers disposed in a first row, a plurality of readers disposed in a second row parallel to the first row, a first servo reader aligned with either the first row or the second row, and a second servo reader aligned in a third row parallel to the first and second rows. The first servo reader and the second servo reader are offset from one another in a first direction and in a second direction perpendicular to the first direction, the first direction being a cross-track direction. The first servo reader and the second servo reader are spaced apart in the first direction about 1 ?m to about 20 ?m.
    Type: Grant
    Filed: June 24, 2022
    Date of Patent: November 14, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventor: Robert G. Biskeborn
  • Patent number: 11803831
    Abstract: Systems, apparatuses, methods, and computer program products are disclosed for facilitating contactless and socially distant payments. Specifically, certain embodiments are configured for generating and utilizing a user expression map for associating user expressions to control events. The methods further correspond to receiving, in real-time, image data representative of at least a portion of a user body, the user body tracked by a contactless human to device interface system. The methods further include causing a retrieval of a user expression map from a first computing device for provision to a second computing device, determining using the user expression map, that the image data is associated with a control event indicative of a directive to perform a particular transaction, and triggering the control event to cause performance of the particular transaction based, at least in part on the determination that the image data is associated with the control event.
    Type: Grant
    Filed: December 2, 2020
    Date of Patent: October 31, 2023
    Assignee: Wells Fargo Bank, N.A.
    Inventor: Chris Kalaboukis
  • Patent number: 11783859
    Abstract: A noncontact communication medium includes a processor, and a memory incorporated in or connected to the processor, and performs noncontact communication with an external communication device. The memory has a storage block where information regarding an attribute of the noncontact communication medium is stored and that includes a plurality of storage fields. The plurality of storage fields include a specification-independent storage field where information independent of a specification of a magnetic tape cartridge, in which the noncontact communication medium is mounted, is stored. The processor is configured to write accompanying information regarding the magnetic tape cartridge in the specification-independent storage field in response to an instruction given from the external communication device to the noncontact communication medium by the noncontact communication.
    Type: Grant
    Filed: November 18, 2022
    Date of Patent: October 10, 2023
    Assignee: FUJIFILM CORPORATION
    Inventor: Eiichiro Kataoka
  • Patent number: 11762043
    Abstract: Methods and apparatus for determining and transmitting speed and/or direction information for a rotating target by a magnetic field sensor. A reference channel signal is generated for a target from at least one magnetic field sensing element and a virtual channel signal in quadrature with the reference channel signal is generated. A tangent signal is generated. A slope of an arctangent of the tangent signal is determined, wherein the slope corresponds to rotational speed of the target. The speed and/or direction of the target can be transmitted by a sensor IC.
    Type: Grant
    Filed: March 2, 2022
    Date of Patent: September 19, 2023
    Assignee: Allegro MicroSystems, LLC
    Inventor: Zachary Richards
  • Patent number: 11756581
    Abstract: Various illustrative aspects are directed to a data storage device comprising data tracks N and N?1, and one or more processing devices, configured to measure signal to noise ratio (SNR) metrics for corresponding sectors of at least one of the data tracks N?1 and N, where the measuring is based at least in part on reading one or more of the data tracks N and N?1 using one or more read offsets, estimate a position of at least one of the data tracks based on measuring the one or more SNR metrics, and reconstruct one or more of risk values for at least a portion of the data track N?1 based on the one or more SNR metrics for the data track N?1, and a position error signal (PES) for at least one of the data tracks N?1 and N based on the corresponding estimated positions.
    Type: Grant
    Filed: March 24, 2022
    Date of Patent: September 12, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: Weldon M. Hanson, Alain Chahwan, Niranjay Ravindran
  • Patent number: 11735220
    Abstract: Systems and methods are disclosed for phase locking of a clock. In some embodiments, a phase locked clock (PLC) module can phase-lock a write clock to a media written with multiple servo zones of different frequencies. In some implementations, this can be utilized to perform a self-servo write (SSW) of a disc surface within a hard disc drive (HDD). A PLC module can perform a method of writing with a single frequency phase coherently while a read element passes over servo zones with different frequencies. While the PLC module can perform such methods for a SSW process, the methods can also be utilized for other applications that can benefit from writing with a single frequency phase coherently based on servo zones with different frequencies.
    Type: Grant
    Filed: December 27, 2021
    Date of Patent: August 22, 2023
    Assignee: Seagate Technology LLC
    Inventors: Zheng Wu, Jason Bellorado
  • Patent number: 11721364
    Abstract: A data storage device includes at least one data storage disc having at least one data storage surface, and at least one read head configured to communicate with the at least one data storage surface. The data storage device also includes a controller communicatively coupled to the at least one read head. The controller is configured to determine a fly height for the at least one read head over the at least one data storage surface as a function of a read workload associated with the at least one data storage surface or as a function of an ability to satisfy a read request to the at least one data storage surface on a first read attempt.
    Type: Grant
    Filed: March 14, 2022
    Date of Patent: August 8, 2023
    Assignee: Seagate Technology LLC
    Inventors: Mark A. Gaertner, Dipeshkumar J. Purani, Richard P. Michel
  • Patent number: 11715493
    Abstract: Example systems, data storage devices, and methods to provide long-term spacing compensation for heat assisted magnetic recording are described. The data storage device includes a storage medium with data tracks and a head that can be positioned for reading and writing those tracks. The head includes a laser for heat assisted magnetic recording and a fly height actuator. Based on the operation of the laser, both a short-term fly height compensation parameter and a long-term fly height compensation parameter are determined based on different temperature state models. The operating power of the fly height actuator is determined, at least in part, based on the short-term and long-term height compensation parameters.
    Type: Grant
    Filed: June 2, 2022
    Date of Patent: August 1, 2023
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Erhard Schreck, Karl Flechsig, Kenji Kuroki
  • Patent number: 11705838
    Abstract: The controller comprises a displacement controller and a rotating speed controller. The displacement controller includes a vibration force compensation control module and a dead-time vibration compensation module. The vibration force compensation control module receives actual displacements and a rotor mechanical angle and outputs corresponding vibration compensation forces. The vibration force compensation control module comprises a first neural network band-pass filter, a second neural network band-pass filter, a third PID controller, and a fourth PID controller. The dead-time vibration compensation module receives a rotor electrical angle and an actual quadrature-direct axis currents and an actual direct axis current and outputs a quadrature-direct axis compensation voltages and a direct axis compensation voltage.
    Type: Grant
    Filed: March 23, 2021
    Date of Patent: July 18, 2023
    Assignee: Jiangsu University
    Inventors: Huangqiu Zhu, Xin Wang
  • Patent number: 11705159
    Abstract: A magnetic tape cartridge includes a case in which a magnetic tape is housed, and an NVM of a cartridge memory provided in the case. The NVM stores cartridge information including an identification ID regarding an allowable range of temperature/humidity in using the magnetic tape, an upper limit of a preservation period of the magnetic tape, and an upper limit of a use frequency of the magnetic tape.
    Type: Grant
    Filed: February 2, 2022
    Date of Patent: July 18, 2023
    Assignee: FUJIFILM CORPORATION
    Inventors: Yusuke Kaneko, Toru Nakao, Atsushi Musha, Norihito Kasada
  • Patent number: 11705154
    Abstract: According to an embodiment, a manufacturing method includes: estimating a distribution of an initial value of a clearance of a magnetic head on a first recording surface; and recording first spiral signals on the first recording surface while controlling a clearance using the distribution of the initial value of the estimated clearance. The manufacturing method includes measuring a distribution of an initial value of a clearance of a magnetic head on a second recording surface under positioning control using the first spiral signals recorded on the first recording surface. The manufacturing method includes recording the first spiral signals on the second recording surface while controlling a clearance using the distribution of the initial value of the measured clearance of the magnetic head on the second recording surface.
    Type: Grant
    Filed: March 15, 2022
    Date of Patent: July 18, 2023
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Takahiro Magome, Satoshi Yamashita, Takahiro Aoki
  • Patent number: 11688467
    Abstract: Described herein are embodiments related to defect detection in memory components of memory systems with time-varying bit error rate. A processing device determines that a bit error rate (BER) corresponding to a read operation to read a unit of data in a memory component satisfies a threshold criterion, determines a write-to-read (W2R) delay for the read operation, wherein the W2R delay comprises a difference between a time of the read operation and a write timestamp indicating when the unit of data was written to the memory component, and determines whether the W2R delay is within a W2R delay range corresponding to an initial read voltage level used by the read operation to read the unit of data. The processing device initiates a defect detection operation responsive to the W2R delay being within the W2R delay range, the defect detection operation to detect time-varying defects in the memory component.
    Type: Grant
    Filed: June 14, 2021
    Date of Patent: June 27, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Zhengang Chen, Sai Krishna Mylavarapu, Zhenlei Shen, Tingjun Xie, Charles S. Kwong
  • Patent number: 11682430
    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 control read/write of the magnetic heads. Each of the plurality of magnetic disks includes a first storage section storing therein control information concerning read/write of the magnetic head. The control section switches the first storage section which is a storage destination of first information that is at least a part of the control information from the magnetic disk to another magnetic disk.
    Type: Grant
    Filed: September 13, 2021
    Date of Patent: June 20, 2023
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Osamu Yoshida, Tatsuo Nitta
  • Patent number: 11662914
    Abstract: A media library (10) for evaluating a health of a head (256) of a media drive (26) includes a library control system (30) that is configured to control oversight functionality of the media library (10). The library control system (30) receives media drive information generated during at least one of a read procedure and a write procedure being performed by the media drive (26) and analyzes the media drive information to determine the health of the head (256) of the media drive (26). The media drive information includes drive performance metrics generated by the media drive (26) during a read verify procedure performed by the media drive (26) upon request of the library control system (30) of the media library (10).
    Type: Grant
    Filed: November 17, 2021
    Date of Patent: May 30, 2023
    Assignee: QUANTUM CORPORATION
    Inventors: James P. Peng, Turguy Goker, Stephen C. Cooper, William R. Weakley
  • Patent number: 11650761
    Abstract: Example systems, data storage devices, and methods to provide data protection during concurrent operations for multiple actuator data storage devices are described. The data storage device includes a plurality of actuators configured to actuate a plurality of heads over different subsets of a plurality of disk surfaces. Responsive to receiving a write command for one of the actuators, the coupling state with at least one other of the actuators is determined and execution of write commands is inhibited if the coupling state indicates a possible coupling event. The inhibit of the write commands in the presence of coupling events may prevent off-track writes and protect data.
    Type: Grant
    Filed: October 27, 2021
    Date of Patent: May 16, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: Shravankumar Bhat, Hideaki Ito, Christopher Wiederholt
  • Patent number: 11646057
    Abstract: Two or more data values are received from one or more sensors of a hard disk drive. The two or more data values are indicative of a fly height of a recording head of the hard disk drive. The two or more data values are input into a machine-learning processor during operation of the hard disk drive. A fly height of the recording head during the operation of the hard drive head is adjusted based on an output of the machine learning processor.
    Type: Grant
    Filed: August 24, 2021
    Date of Patent: May 9, 2023
    Assignee: Seagate Technology LLC
    Inventors: Zheng Wang, Ara Patapoutian, Timothy F. Ellis, Jason Bellorado, William M. Radich
  • Patent number: 11647306
    Abstract: A solid-state imaging device includes: a pixel unit that outputs a pixel signal corresponding to an amount of incident light; an A/D converter that performs A/D conversion on the pixel signal; and a D/A conversion circuit that generates a reference signal to be used by the A/D converter. The D/A conversion circuit includes a first buffer circuit that outputs a base voltage VTOP for generating the reference signal, and the first buffer circuit includes a differential pair circuit including a first transistor and a second transistor, and a suppression circuit that suppresses a variation in the base voltage by canceling out a characteristic difference between the first transistor and the second transistor.
    Type: Grant
    Filed: November 9, 2021
    Date of Patent: May 9, 2023
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventor: Yusuke Tokunaga
  • Patent number: 11646052
    Abstract: A magnetic recording write head and system has a spin-torque oscillator (STO) located between the write head's write pole and trailing shield. The STO's ferromagnetic free layer is located near the write pole with a multilayer seed layer between the write pole and the free layer. The STO's nonmagnetic spacer layer is between the free layer and the STO's ferromagnetic polarizer. The polarizer may be the trailing shield of the write head, one or more separate polarizer layers, or combinations thereof. The STO electrical circuitry causes electron flow from the write pole to the trailing shield. The multilayer seed layer removes the spin polarization of electrons from the write pole, which enables electrons reflected from the polarizer layer to become spin polarized, which creates the spin transfer torque on the magnetization of the free layer. The multilayer seed layer includes a Mn or a Mn-alloy layer.
    Type: Grant
    Filed: April 12, 2021
    Date of Patent: May 9, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: James Mac Freitag, Zheng Gao, Masahiko Hashimoto, Sangmun Oh
  • Patent number: 11631424
    Abstract: The technology disclosed herein provides a method including determining an acceptable parameter rate for a dual reader storage device having dual readers, identifying one of the dual readers as the preferable reader, comparing an actual parameter rate of the storage device to the acceptable parameter rate of the storage device, and in response to determining that the actual parameter rate is below the acceptable parameter rate, operating the storage device using only the preferable reader. In one implementation, the parameter rate is bit-error rate (BER) of the dual readers.
    Type: Grant
    Filed: March 3, 2022
    Date of Patent: April 18, 2023
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Xiong Liu, Quan Li
  • Patent number: 11610602
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, an electric power supply section, a control section, and an address storage section. The control section reads data from the magnetic disk by means of the read head on the basis of the address stored in the address storage section at predetermined timing, and writes the read data to the magnetic disk by means of the write head without suppressing the magnetic field range.
    Type: Grant
    Filed: February 23, 2022
    Date of Patent: March 21, 2023
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Yoshinori Asagi
  • Patent number: 11605397
    Abstract: Aspects of the present disclosure provide various magnetic recording slider structures and fabrication methods that can reduce head overcoat (HOC) thickness without significantly reducing the lifetime and reliability of a slider by using a protective cap placed on preselected locations on the outermost surface or HOC of the slider. A slider includes a writer comprising an energy-assisted recording element. The writer is configured to store information on a magnetic medium using the energy-assisted recording element. The slider includes a head overcoat (HOC) layer providing an outermost media facing surface. The slider further includes a protective cap positioned on the HOC layer to at least partially cover the energy-assisted recording element, the protective cap including a preselected shape configured to protect the energy-assisted recording element.
    Type: Grant
    Filed: June 16, 2021
    Date of Patent: March 14, 2023
    Assignee: Western Digital Technologies, Inc.
    Inventors: John Pierre Herber, Mark David Alnas Alias, Aileen Ticzon Jara, Reimar Azupardo
  • Patent number: 11600292
    Abstract: According to one embodiment, a magnetic disk device comprises a magnetic disk, a magnetic head, a monitoring unit, and a control unit. When carrying out write of data to a first track, if an absolute difference between a light output monitored by the monitoring unit at the time of write and a light output monitored last time by the monitoring unit exceeds a predetermined value, the control unit controls a position of a write head and writes data again to the first track or a second track one track before the first track.
    Type: Grant
    Filed: December 13, 2021
    Date of Patent: March 7, 2023
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Takuya Matsumoto, Yusuke Tomoda
  • Patent number: 11594246
    Abstract: According to one embodiment, a disk device includes a plurality of recording media, a plurality of magnetic heads, a plurality of blades, and a housing. The recording medium has a recording surface, is rotatable around a rotation axis extending in an axial direction intersecting the recording surface, and is aligned in the axial direction. The magnetic head is configured to read and write information from and to the plurality of recording media. The plurality of first blades forms a spoiler, and the first blades of the plurality are located in a plurality of gaps provided between the plurality of recording media. The housing is provided with an inner chamber in which the plurality of recording media, the plurality of magnetic heads, and the plurality of first blades are accommodated. The number of first blades is smaller than the number of gaps.
    Type: Grant
    Filed: October 28, 2021
    Date of Patent: February 28, 2023
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Sinji Tukada
  • Patent number: 11575342
    Abstract: A motor driving system includes motor driving circuitry configured to operate an electric motor. The system further includes a controller that is configured to send a signal to energize the electric motor and to measure a back electromotive force voltage of the electric motor. The controller is further configured to determine a temperature value based on the measured back electromotive force voltage using a back electromotive force voltage mapping that maps back electromotive force voltages to temperature values. The controller is further configured to determine an expected winding resistance value based on the determined temperature value using a resistance mapping that maps winding resistance values to temperature values. The controller is further configured to measure a winding resistance of the electric motor, to compare the measured winding resistance of the electric motor to the expected winding resistance value, and to output a match result indication based on the comparison.
    Type: Grant
    Filed: September 22, 2020
    Date of Patent: February 7, 2023
    Assignee: Lennox Industries Inc.
    Inventors: Jose Sandoval, Palanivel Subramaniam, Harvey Veselka
  • Patent number: 11574650
    Abstract: A method for writing servo information in a disk drive that includes a write head and one or more recording surfaces includes: writing a first portion of a first spiral with the write head on a first recording surface of the one or more recording surfaces while controlling a radial position of the write head with a controller that is configured with a first set of controller parameter values; after the read head crosses a second spiral formed on a second recording surface of the one or more recording surfaces, determining a radial position error for the write head based on information associated with the second spiral; and in response to the radial position error exceeding a disturbance threshold value, writing a second portion of the first spiral with the write head while controlling the radial position of the write head with the controller while the controller is configured with a second set of controller parameter values.
    Type: Grant
    Filed: March 3, 2022
    Date of Patent: February 7, 2023
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Jiangang Liang, Zhi Wang
  • Patent number: 11571142
    Abstract: A fall detection and identification system includes a tag worn by a user and a server. The tag collects acceleration data from one or more sensors embedded within the tag and transmits the data to the server. The server receives the data from the tag and performs an analysis on the data to detect and identify a fall. The analysis includes determining a change in acceleration of the user over the time window based on the acceleration data; comparing the change in acceleration of the user against one or more thresholds; and determining a status of the user based on the comparison of the change in acceleration of the user against the one or more thresholds.
    Type: Grant
    Filed: July 18, 2019
    Date of Patent: February 7, 2023
    Assignee: AMERICAN INTERNATIONAL GROUP, INC.
    Inventors: Mohsen Sarraf, Sergey Vikhlyantsev, Jennifer Martinez
  • Patent number: 11566917
    Abstract: A system includes a substrate, a first and a second magnetic field sensor, and a computing device communicatively coupled to the first and second magnetic field sensors. The substrate has a surface encoded with a magnetic pattern sequenced along a direction of movement of the substrate. The magnetic pattern includes a data pattern that indicates a position of the substrate along the direction of movement and a clock pattern interleaved and substantially colinear with the data pattern that indicates a plurality of clock transitions. The computing device is configured to receive, from the first and second magnetic field sensors positioned above the magnetic pattern, a plurality of magnetic field signals detected from the magnetic pattern. The computing device is configured to determine, based on the plurality of magnetic field signals, the position of the substrate and output the position of the substrate.
    Type: Grant
    Filed: October 9, 2019
    Date of Patent: January 31, 2023
    Assignee: SRI INTERNATIONAL
    Inventors: Paolo Sechi, Alan Leong
  • Patent number: 11568894
    Abstract: A method for collecting position information in a disk drive having a read head and a disk with a set of spirals formed thereon includes: while the read head crosses a first spiral included in the set of spirals, opening a first frame integration window; while the first frame integration window is open, generating first signals with the read head as the read head crosses over a first set of magnetic transitions; closing the first frame integration window; after closing the first frame integration window, generating second signals with the read head as the read head crosses over a second set of magnetic transitions; and determining a radial position of the read head by integrating amplitudes of the first signals, wherein the first set includes magnetic transitions having a first polarity, and the second set includes two or more magnetic transitions having a second polarity.
    Type: Grant
    Filed: February 3, 2022
    Date of Patent: January 31, 2023
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Gabor Szita
  • Patent number: 11562767
    Abstract: An integrated circuit includes a read/write channel and a servo controller. The read/write channel is configured to: determine, in connection with a first path, respective read errors associated with N number of the data sectors; estimate respective offset positions of the N number of the data sectors; and generate a second path based, at least in part, on the respective estimated offset positions. The servo controller is configured to cause adjustment of a position of a read transducer based on the second path.
    Type: Grant
    Filed: September 8, 2021
    Date of Patent: January 24, 2023
    Assignee: Seagate Technology LLC
    Inventors: Ara Patapoutian, Jason Bellorado, Zheng Wang, William M. Radich
  • Patent number: 11557312
    Abstract: According to one embodiment, a magnetic disk device includes a first disk, the second disk, and a first head which writes and reads to the first disk, a second head which writes and reads to the second disk, and a controller which calculates an estimated position at which the second head is estimated to be disposed on the second disk based on first relative position information related to a relative position in a radial direction between the first head and the second head when the first head is switched to the second head.
    Type: Grant
    Filed: September 2, 2021
    Date of Patent: January 17, 2023
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Daisuke Sudo, Takeyori Hara
  • Patent number: 11557320
    Abstract: A method for writing repeatable run-out (RRO) data, to surfaces of a rotating magnetic storage medium in a storage device having two read channels, includes detecting, with a first head, using a first read channel, a servo sync mark (SSM) on a first track on a first surface, establishing a recurring servo-gating signal at a successive fixed interval from the SSM, detecting, with the first head, servo signals from the first track on occurrence of the recurring servo-gating signal, processing the servo signals from the first track, to generate first positioning signals for positioning the first head relative to the first track, following a similar procedure with a second read channel having a second head to generate second positioning signals for the second read head, and writing first and second RRO data to servo wedges of the first and second tracks according to the respective positioning signals.
    Type: Grant
    Filed: January 5, 2022
    Date of Patent: January 17, 2023
    Assignee: Marvell Asia Pte Ltd
    Inventor: Supaket Katchmart
  • Patent number: 11557313
    Abstract: According to one embodiment, a magnetic disk device includes a first disk including a first data sector, a second disk including a second data sector, a first head including a first read head, a second head including a second read head, a first controller that stops write operations of both the first head and the second head based on first data sector position error information obtained by reading and demodulating the first data sector by using the first read head, and a second controller that stops the write operations of both the first head and the second head based on second data sector position error information obtained by reading and demodulating the second data sector by using the second read head.
    Type: Grant
    Filed: January 27, 2022
    Date of Patent: January 17, 2023
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Daisuke Sudo
  • Patent number: 11532327
    Abstract: A storage device includes a controller that determines a degree of data degradation for a data track targeted by a pending read command and sets a head/media clearance parameter for execution of the read command based on the determined degree of data degradation for the data track, the head/media clearance parameter providing for a greater head-media separation when the determined level of degradation is lower than when the determined level of degradation is higher.
    Type: Grant
    Filed: April 28, 2020
    Date of Patent: December 20, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Xiong Liu, Quan Li, Li Hong Zhang
  • Patent number: 11532331
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, a heater a control section. When making the magnetic head carry out the seek operation from the first position to the second position, the control section starts application of a first voltage to the heater while the seek operation is carried out and, after application of the first voltage, makes the voltage to be applied to the heater a second voltage greater than the first voltage before the magnetic head is positioned to the second position and write of data is started by the magnetic head.
    Type: Grant
    Filed: August 12, 2021
    Date of Patent: December 20, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Masami Yamane
  • Patent number: 11532326
    Abstract: A data storage device is disclosed comprising a head actuated over a disk. A spiral track is written on the disk, and a disk locked clock (DLC) is synchronized to the spiral track. The spiral track is read to generate a spiral track crossing signal, and the spiral track crossing signal is processed to generate a position error signal (PES) representing a position of the head over the disk. When the DLC indicates a first part of the spiral track crossing signal is corrupt, the corruption is compensated in order to generate a compensated PES. While servoing the head over the disk based on the PES, a plurality of concentric servo sectors are written on the disk based on the DLC.
    Type: Grant
    Filed: August 2, 2021
    Date of Patent: December 20, 2022
    Assignee: Western Digital Technologies, Inc.
    Inventor: Jason H. Laks
  • Patent number: 11521646
    Abstract: According to one embodiment, there is provided a hard disk drive including a first recording surface, a second recording surface, a first magnetic head, a first actuator and a second actuator that move the first magnetic head, a second magnetic head, a third actuator and a fourth actuator that move the second magnetic head, a fifth actuator that moves the second actuator and the fourth actuator, a drive circuit that implements at least one of a first mode in which the second actuator and the fourth actuator operate differently from each other or a second mode in which the first and third actuators operate differently from each other, and a controller that controls the drive circuit.
    Type: Grant
    Filed: April 7, 2021
    Date of Patent: December 6, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Koichiro Miyamoto, Kenichiro Oozeki, Yu Chen
  • Patent number: 11514939
    Abstract: A victim feedforward signal is added to a microactuator control signal of the victim actuator in response to a voice-coil motor (VCM) control signal that is applied to the aggressor actuator, where the victim feedforward signal is configured to compensate for disturbances to a victim head caused by assertion of the aggressor VCM control signal. Each aggressor VCM control signal is asserted at a specific time by the aggressor actuator, for example in response to the aggressor head passing over a first servo wedge. A feedforward signal that compensates for the effect of the aggressor VCM control signal is then determined based on the aggressor VCM control signal, stored, and asserted via the victim microactuator at a predetermined time relative to when the aggressor VCM control signal is asserted.
    Type: Grant
    Filed: November 24, 2021
    Date of Patent: November 29, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Richard M. Ehrlich
  • Patent number: 11508409
    Abstract: According to one embodiment, a magnetic disk device includes a disk including a normal recording region written in a normal recording and a shingled recording region written in a shingled recording, a head including a write head and a plurality of read heads, the head moving on the disk by rotation about a rotation axis, and a controller which selects and executes the normal recording and the shingled recording, wherein a first minimum value of a cross track interval in the radial direction of the disk between two read heads in the plurality of read heads in the normal recording region is smaller than a first maximum value of the cross track interval in the shingled recording region.
    Type: Grant
    Filed: August 20, 2021
    Date of Patent: November 22, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Yusuke Tomoda
  • Patent number: 11508398
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a head and a controller. The head writes data to the magnetic disk and reads data from the magnetic disk. The controller once reads the data written to a predetermined recording area according to the number of writes of data to the predetermined recording area of the magnetic disk and rewrites the read data to the predetermined recording area. The controller adjusts an additive value to the number of writes based on the presence or absence of a defect on the recording surface of the magnetic disk.
    Type: Grant
    Filed: July 27, 2021
    Date of Patent: November 22, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Takeshi Shibasaki
  • Patent number: 11496034
    Abstract: A haptic engine includes a linear resonant actuator having a double-wound driving coil which is used for sensing a back electromotive force (EMF) voltage independently of the coil resistance, thus minimizing the back EMF voltage's sensitivity to temperature.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: November 8, 2022
    Assignee: Apple Inc.
    Inventors: Riccardo Tarelli, Yumeng Liu
  • Patent number: 11495249
    Abstract: Two or more different recording currents are applied to a write coil of a recording head. A first of the two or more currents is a positive current and a second of the two or more currents is a negative current. In response to the application of the two or more different recording currents, a data stream is recorded to regions of a moving continuous magnetic recording medium such that each region has three or more magnetic states. The three or more magnetic states can be read from the continuous magnetic recording medium via a magnetic read transducer to recover the data stream.
    Type: Grant
    Filed: April 12, 2021
    Date of Patent: November 8, 2022
    Assignee: Seagate Technology LLC
    Inventors: Ian James Gilbert, Peng Peng, Todd Michael Lammers, Tim Rausch
  • Patent number: 11486705
    Abstract: A remote operation system of a surveying instrument includes a surveying instrument including a survey unit, a control unit, a management server capable of communicating with the surveying instrument through the communication network, a remote terminal configured to command the management server to add a function of the surveying instrument through the communication network, and a billing system connected to the communication network, wherein the remote terminal commands the management server MS to consume a quantity of virtual currency corresponding to addition of the function, the management server adds the function of the surveying instrument when the quantity of virtual currency corresponding to addition of the function is consumed based on the command from the remote terminal, and the billing system executes a billing process based on billing data corresponding to the quantity of virtual currency.
    Type: Grant
    Filed: June 25, 2018
    Date of Patent: November 1, 2022
    Assignee: TOPCON CORPORATION
    Inventor: Takeshi Kikuchi
  • Patent number: 11482252
    Abstract: According to one embodiment, when an inspection of a defect of a recording surface of the magnetic disk is carried out by using the first processing section and the second processing section on the basis of the output of the gap sensor, a magnetic disk device is configured to compare a threshold defined on the basis of outputs of the first processing section at a plurality of tracks excluding a track which is an inspection object and an output of the first processing section at the track which is the inspection object with each other and, when the output of the first processing section at the track which is the inspection object exceeds the threshold, detect that there is a defect on the track concerned of the magnetic disk.
    Type: Grant
    Filed: September 7, 2021
    Date of Patent: October 25, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Toru Watanabe
  • Patent number: 11475913
    Abstract: According to one embodiment, a magnetic disk device includes a disk having first servo data including a first preamble, a first servo mark, a first gray code, first burst data, and second burst data written after the first burst data, a head including a write head that writes data to the disk and a first read head and a second read head that read data from the disk, and a controller that reads the second burst data using the first read head and the second read head and calculates a servo demodulation position when the first servo data is servo-read without reading the first burst data in a short servo mode in which the first preamble, the first servo mark, and the first gray code are not read.
    Type: Grant
    Filed: August 20, 2021
    Date of Patent: October 18, 2022
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Naoki Tagami
  • Patent number: 11462245
    Abstract: A method includes determining at least one of an areal density margin or a reliability margin for a combination of a head and a data storage surface in a data storage drive. The method also includes employing the determined at least one of the AD margin or the reliability margin to adjust an on-cylinder limit value associated with the combination of the head and the data storage surface.
    Type: Grant
    Filed: August 25, 2021
    Date of Patent: October 4, 2022
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Raye A. Sosseh, Richard P. Michel, Evgeny Rafaelovich Kharisov, Mark A. Gaertner
  • Patent number: 11450345
    Abstract: A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate including a polyester as a main component, a base layer disposed on the substrate, and a magnetic layer disposed on the base layer. The kurtosis of the surface of the magnetic layer is 3.0 or more. The base layer and the magnetic layer each include a lubricant including a fatty acid and a fatty acid ester. In the lubricant, a ratio of the content of the fatty acid to the content of the fatty acid ester is less than 0.6.
    Type: Grant
    Filed: October 1, 2019
    Date of Patent: September 20, 2022
    Assignee: Sony Corporation
    Inventors: Minoru Yamaga, Takanobu Iwama, Jun Takahashi
  • Patent number: 11450341
    Abstract: An apparatus comprises a write pole for writing data to a magnetic recording medium and a near-field transducer (NFT) optically coupled to a laser source and configured to produce a thermal spot on the medium. A laser driver applies laser operation power (Iop) to the laser source. A channel circuit generates symbols having a length of nT, where T is a channel clock rate and n is an integer. The laser driver applies Iop to the laser source and a write driver applies bi-directional write currents to the write pole to record the symbols at a location of the thermal spot on the medium, wherein a duration of applying Iop to the laser source by the laser driver is dependent on a length of the symbols and the effective thermal spot size.
    Type: Grant
    Filed: August 20, 2021
    Date of Patent: September 20, 2022
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Quan Li
  • Patent number: 11437935
    Abstract: A method may include controlling commutation of a plurality of switches of an output stage comprising the plurality of switches in order to transfer charge between an energy storage device and a load to generate an output voltage across the load as an amplified version of an input signal, wherein the load comprises capacitive energy storage and controlling the power converter in order to regulate a cumulative electrical energy present in the system at an energy target, wherein the power converter is configured to transfer electrical energy from a source of electrical energy coupled to an input of the power converter to the energy storage device coupled to the output of the power converter and configured to store the electrical energy transferred from the source of electrical energy.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: September 6, 2022
    Assignee: Cirrus Logic, Inc.
    Inventors: Eric J. King, John L. Melanson
  • 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