Patents Examined by Nabil Z. Hindi
  • Patent number: 10854238
    Abstract: According to one embodiment, a magnetic disk device includes a disk including a recording region including servo sectors, a head configured to write data to the disk and read data from the disk, and a controller configured to demodulate a plurality of pieces of demodulation data from servo data read from servo sectors, divide the demodulation data into a plurality of pieces of division data corresponding to division regions, perform linearity correction corresponding to a plurality of pieces of division data in each of the division regions.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: December 1, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Naoki Tagami, Makoto Asakura, Takeyori Hara
  • Patent number: 10847180
    Abstract: A method including obtaining a target actuation efficiency slope that is a linear function of temperature when a fixed active clearance is maintained between a transducing head and an adjacent storage surface in a sealed storage device. The target efficiency slope is obtained at least in part by a temperature dependence calibration of actuation efficiency. An operating temperature of the storage device is measure. Power to a clearance adjustment mechanism is adjusted to achieve the target actuation efficiency slope at the measured operating temperature.
    Type: Grant
    Filed: November 14, 2019
    Date of Patent: November 24, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Richard Edward Martin
  • Patent number: 10847182
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk section and a control section. The magnetic disk section includes a magnetic disk, a magnetic head, and a preamplifier. The control section included a processing section configured to cause the preamplifier to execute processing of generating the recording current used by a write head to write data to the magnetic disk, and processing of receiving an output reproduced from the magnetic disk by a read head, and configured to control the magnetic disk section. In the preamplifier, processing of reading data from the magnetic disk is executed by the read head in parallel with processing of writing data transferred from the control section to the magnetic disk by means of the write head.
    Type: Grant
    Filed: September 11, 2019
    Date of Patent: November 24, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Takao Furuhashi
  • Patent number: 10847183
    Abstract: A magnetic disk device includes a disk, a head comprising a main magnetic pole and a write shield, and configured to generate a magnetic field from the main magnetic pole to the write shield to write data onto the disk, an assist element configured to assist the writing by generating a magnetic field or heating a surface of the disk, and a controller configured to control the head to write the data according to either a first recording method using the assist element or a second recording method not using the assist element depending on a condition of the assist element.
    Type: Grant
    Filed: August 20, 2019
    Date of Patent: November 24, 2020
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Yusuke Tomoda
  • Patent number: 10839839
    Abstract: A data storage device is disclosed comprising a first actuator configured to actuate a first head over a first disk surface, and a second actuator configure to actuate a second head over a second disk surface. A first seek of the first head over the first disk surface is initiated during a first seek time based on a first seek profile. A second seek of the second head over the second disk surface is initiated during a second seek time based on a second seek profile. When the second seek time at least partially overlaps the first seek time and at least the second seek profile is a de-rated seek profile, the second seek profile is adjusted to avoid an overcurrent condition.
    Type: Grant
    Filed: February 4, 2020
    Date of Patent: November 17, 2020
    Assignee: Western Digital Technologies, Inc.
    Inventors: Hiroshi Uchida, Hidehiko Numasato, KeXiu Liu, Shrey Khanna
  • Patent number: 10839842
    Abstract: A data storage drive includes a servo loop for positioning a head over a disc. The servo loop includes a sensor, located in the head, that senses servo information located on the disc and produces a servo signal therefrom. The servo signal is combined with a reference signal to produce a raw position error signal (PES). The servo loop further also at least one phase-matching disturbance attenuation (PMDA) filter that receives the raw PES as an input and responsively outputs a vibration-cancellation signal, which, when combined with the raw PES, cancels vibration-induced disturbance from the raw PES, thereby producing a refined PES. A servo controller receives the refined PES and responsively produces a servo control signal. An actuator moves the head in response to receiving the servo control signal.
    Type: Grant
    Filed: February 27, 2020
    Date of Patent: November 17, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: WenJun Cao, Qiang Bi, Brent Jay Harmer, Kian Keong Ooi
  • Patent number: 10832739
    Abstract: A system includes a processor and logic integrated with the processor, executable by the processor, or integrated with and executable by the processor, the logic being configured to gather usage data of a tape drive during usage thereof and create and/or update a usage model based on the usage data. The logic is configured to determine that the usage model has reached a predefined confidence level and perform an action for extending a life of the tape drive in response to determining that the usage model has reached the predefined confidence level.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventors: Jason Liang, Ho-Yiu Lam
  • Patent number: 10832722
    Abstract: An apparatus, according to one embodiment, includes a magnetic head having servo readers of known pitch, a drive mechanism for passing a magnetic recording tape over the magnetic head, and a controller electrically coupled to the magnetic head. The controller is configured to measure, using signals from the magnetic head, a servo band difference at various locations along a length of the magnetic recording tape. The controller is also configured to cause storage of servo band difference information about the servo band difference measurements in association with the magnetic recording tape.
    Type: Grant
    Filed: October 23, 2019
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventors: Kevin B. Judd, Randy C. Inch, Eiji Ogura, Ernest S. Gale, Pamela R. Nylander-Hill, Dale A. Christiansen, Paul M. Greco, Kevin D. Butt, Steven M. Wallace
  • Patent number: 10832703
    Abstract: A computer-implemented method for incrementing a tape write pass (WP) value includes identifying an action that requires incrementing a tape WP value on a magnetic tape storage device. The computer-implemented method further includes, in response to identifying the action that requires incrementing the tape WP value on the magnetic tape storage device: assigning a new tape WP value to a dataset based, at least in part, on a partition number corresponding to the data partition in which the dataset is written to.
    Type: Grant
    Filed: September 20, 2019
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventors: Setsuko Masuda, Tsuyoshi Miyamura
  • Patent number: 10832714
    Abstract: A tape cartridge according to one aspect includes a tape formatted with a servo pattern having at least two servo tracks thereon. The tape cartridge having stored therein a value corresponding to a difference between a specified distance between adjacent servo tracks and an average distance between adjacent servo tracks on the tape. The average distance is an average of actual distances between adjacent servo tracks over a portion of the tape. Various computer program products for using such a tape cartridge are also disclosed.
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventor: Robert G. Biskeborn
  • Patent number: 10832723
    Abstract: A computer-implemented method includes instructing performance of a data operation on a magnetic recording tape using a primary drive, wherein the primary drive rewinds the magnetic recording tape onto a spool at a first tension. The method also includes instructing transfer of the magnetic recording tape to a rewinder drive after performance of the data operation and instructing the rewinder drive to perform a low-tension rewind operation. The low-tension rewind operation includes unspooling the magnetic recording tape from the spool and rewinding the magnetic recording tape onto the spool at a second tension lower than the first tension.
    Type: Grant
    Filed: January 7, 2020
    Date of Patent: November 10, 2020
    Assignee: International Business Machines Corporation
    Inventors: Shawn M. Nave, Lee Jesionowski, Michael Philip McIntosh
  • Patent number: 10832716
    Abstract: Zone self-servo write (SSW) technology is disclosed that leverages two clock signals synchronized in parallel to transition between zones to write servo patterns at different frequencies while minimizing error rate despite the different frequencies. Two separate clock signals (“clocks”) are used to locate and lock to different reference spirals. By updating both clocks in parallel instead of in series, error rate for writing while stepping up frequency across zones is reduced.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: November 10, 2020
    Assignee: MARVELL ASIA PTE, LTD.
    Inventor: Supaket Katchmart
  • Patent number: 10832726
    Abstract: A method includes monitoring operations performed on tracks in a main storage area of a disc, and identifying a track of the tracks in the main storage area susceptible to adjacent track interference (ATI). When a track is identified, the identified track or an adjacent track which contributes to ATI of the identified track is remapped to an ATI safe zone of the disc having a tracks per inch (TPI) density lower than a TPI density of the main storage area.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: November 10, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Choon Wei Ng, Kok Choon See, Jian Qiang, LiBin Cai
  • Patent number: 10825478
    Abstract: According to one embodiment, a magnetic recording apparatus measures and stores recording signal quality of a disk at an initial stage, inspects the recording signal quality before data is recorded, determines whether or not the recording signal quality obtained in the inspection satisfies a standard when compared to the stored recording signal quality at the initial stage, adjusts, based on a result of the determination, light irradiation power of a light irradiation element so as to satisfy the standard, determines a read offset amount based on a result of the adjustment, and performs control so that a position of a read head is shifted based on the determined read offset amount.
    Type: Grant
    Filed: January 27, 2020
    Date of Patent: November 3, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Takuya Matsumoto
  • Patent number: 10825473
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a recording head and a controller. The recording head includes a high-frequency oscillator disposed in a write gap between a main magnetic pole and a return magnetic pole and configured to oscillate in accordance with a bias voltage, and a bias voltage supply circuit configured to supply the bias voltage to the high-frequency oscillator. The controller includes a bias voltage controller configured to control the bias voltage to be applied to the high-frequency oscillator in accordance with a sampling frequency of data when the data is recorded on the magnetic disk by the recording head.
    Type: Grant
    Filed: October 17, 2019
    Date of Patent: November 3, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Gaku Koizumi
  • Patent number: 10825474
    Abstract: A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: November 3, 2020
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: Joey M. Poss, Ian Robson McFadyen, Jih-shiuan Luo, Yunfei Ding
  • Patent number: 10811045
    Abstract: An apparatus includes a plurality of storage media mounted on a rotatable spindle. The apparatus also includes an actuator with at least one actuator arm configured to translate among the plurality of storage media and at least two heads supported on the at least one actuator arm. Each of the at least two heads is configured to communicate with the plurality of storage media.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: October 20, 2020
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Riyan Alex Mendonsa, Edward Charles Gage, Kevin Gomez
  • Patent number: 10811049
    Abstract: A data object has a lock and a condition indicator associated with it. Based at least partly on detecting a first setting of the condition indicator, a reader stores an indication that the reader has obtained read access to the data object in an element of a readers structure and reads the data object without acquiring the lock. A writer detects the first setting and replaces it with a second setting, indicating that the lock is to be acquired by readers before reading the data object. Prior to performing a write on the data object, the writer verifies that one or more elements of the readers structure have been cleared.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: October 20, 2020
    Assignee: Oracle International Corporation
    Inventors: David Dice, Alex Kogan
  • Patent number: 10811048
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing S0.5 measured, after n-hexane cleaning, on a surface of the magnetic layer under a pressure of 0.5 atm by optical interferometry and a spacing S13.5 measured, after n-hexane cleaning, under a pressure of 13.5 atm is 3.0 nm or less, and S0.5 is 5.0 nm or more.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: October 20, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Patent number: 10802085
    Abstract: A system determines the data stored on a piece of magnetic media by obtaining an image that represents the magnetic state of the piece of magnetic media using a magneto-optic image sensor. In an example, the image sensor is connected to a mechanism that moves over the piece of magnetic media, and the system takes a plurality of images which are stitched together into a composite image of the state of the piece of magnetic media. The system analyzes the image to identify regions that contain data, extracts the encoded data from the regions. The encoded data is decoded in accordance with an encoding scheme used by the piece of magnetic media. In some examples, a file structure is applied to the data and data files are recovered from the image. In various examples, the piece of magnetic media can be hard disk media, floppy disk media, or magnetic tape.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: October 13, 2020
    Assignee: Vulcan Inc.
    Inventors: Keith John Perez, Stephen Milton Jones