Patents Examined by Nabil Z. Hindi
  • Patent number: 11189316
    Abstract: In an approach to adaptive tape calibration criteria based on the number of stop writes, the number of rewrite occurrences caused by a stop write is determined for each specific tape drive type. Responsive to detecting a stop write during a write operation, the total number of stop writes is stored on the tape drive. A rewrite calibration threshold is determined, where the rewrite calibration threshold includes the total number of stop writes on the tape drive and a calibration reference value for the specific tape drive type. Responsive to the number of rewrite occurrences caused by the stop write exceeding the rewrite calibration threshold while writing a data set on the tape drive, a calibration of the tape drive is performed.
    Type: Grant
    Filed: February 11, 2021
    Date of Patent: November 30, 2021
    Assignee: International Business Machines Corporation
    Inventors: Tsuyoshi Miyamura, Keisuke Tanaka, Ernest Stewart Gale
  • Patent number: 11189317
    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: September 30, 2020
    Date of Patent: November 30, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Takuya Matsumoto
  • Patent number: 11189314
    Abstract: A magnetic recording medium is provided and includes a substrate; a magnetic layer; an underlayer between the substrate and the magnetic layer; and a back layer, wherein (wmax?wmin)/wmin?400 [ppm]??(1) where wmax and wmin are respectively maximum and minimum of average values of width corresponding to samples of magnetic recording medium measured after the samples are stored for two hours under storage conditions (a loading tension in the longitudinal direction of the magnetic recording medium, a temperature and a relative humidity) for each of the samples, and a width of a sample of the magnetic recording medium at 25° C. and 50% relative humidity and without loading is ½ inch.
    Type: Grant
    Filed: January 22, 2021
    Date of Patent: November 30, 2021
    Assignee: Sony Corporation
    Inventors: Minoru Yamaga, Noboru Sekiguchi
  • Patent number: 11189309
    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: February 3, 2021
    Date of Patent: November 30, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Richard M. Ehrlich
  • Patent number: 11183210
    Abstract: According to one embodiment, the controller of the magnetic disk drive configured to synthesize the first positioning data and second positioning data obtained by the second reader reading the positioning information based on the evaluation data, and performs positioning of the magnetic head based on the synthesized positioning data.
    Type: Grant
    Filed: September 15, 2020
    Date of Patent: November 23, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventor: Isamu Tomita
  • Patent number: 11183207
    Abstract: The presently disclosed technology teaches integrating disc drive electronics into a transducer head. Decreased electrical transit times and data processing times can be achieved by placing the electronics on or within the transducer head because electrical connections may be made physically shorter than in conventional systems. The electronics may include one or more of a control system circuit, a write driver, and/or a data buffer. The control system circuit generates a modified clock signal that has a fixed relation to phase and frequency of a bit-detected reference signal that corresponds to positions of patterned bits on the disc. The write driver writes outgoing data bits received from an external connection to off-head electronics directly to the writer synchronized with the modified clock signal. The data buffer stores and converts digital data bits sent from the off-head electronics to an analog signal that is synchronized with the modified clock signal.
    Type: Grant
    Filed: August 4, 2020
    Date of Patent: November 23, 2021
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Mark Anthony Gubbins, Robert William Lamberton, Robert Edward Weinstein, James Joseph Touchton
  • Patent number: 11176965
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head including an assist part to assist recording of data into the magnetic disk, a controller configured to control the recording of data by the magnetic head based on a recording condition, and a memory configured to record a first threshold value used to define that an assist element included in the assist part is in a deterioration condition. Furthermore, the controller detects the condition of the assist element, determines whether or not the recording condition is changed based on the detected condition and the first threshold value stored in the memory, and changes the recording condition based on the result of the determination.
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: November 16, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Mio Okada, Toru Watanabe, Gaku Koizumi, Yusuke Tomoda
  • Patent number: 11170815
    Abstract: An apparatus may comprise a circuit configured to receive first underlying data corresponding to a first signal and receive a second signal corresponding to second underlying data. The circuit may determine an interference component signal based on the first underlying data corresponding to the first signal and a first channel pulse response shape for the first signal, determine estimated decisions corresponding to the second signal based on the second signal, and determine an estimated signal based on the estimated decisions corresponding to the second signal and a second channel pulse response shape for the second signal. The circuit may then generate a remaining signal based on the estimated signal and the second signal, generate an error signal based on the interference component signal and the remaining signal, and adapt one or more parameters of the first channel pulse response shape based on the error signal.
    Type: Grant
    Filed: August 6, 2020
    Date of Patent: November 9, 2021
    Assignee: Seagate Technology LLC
    Inventors: Zheng Wu, Jason Bellorado, Marcus Marrow, Vincent Brendan Ashe
  • Patent number: 11170816
    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: September 14, 2020
    Date of Patent: November 9, 2021
    Assignee: Oracle International Corporation
    Inventors: David Dice, Alex Kogan
  • Patent number: 11152028
    Abstract: The present invention relates to the technical field of holographic multiplexing storage, and in particular, to a multiplexing method for increasing storage capacity in a disc-type holographic storage medium. According to the method disclosed by the present invention, holograms with different grating vector directions can be overwritten and recorded in the same storage medium according to Bragg selection characteristics of volume holographic records, and the obtained holograms do not affect each other. According to the method disclosed by the present invention, on the premise of ensuring low crosstalk between data pages, the multiplexing number of shift multiplexing storage is increased by using a cross-shift multiplexing method, and the storage density is improved.
    Type: Grant
    Filed: December 28, 2020
    Date of Patent: October 19, 2021
    Assignee: AMETHYSTUM STORAGE TECHNOLOGY CO., LTD.
    Inventors: Mu Zheng, Tiewei Luo, Jun Tian, Dejiao Hu, Yicheng Liu
  • Patent number: 11152029
    Abstract: According to one embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, and a controller. The magnetic disk has a plurality of tracks. The magnetic head performs reading and writing from and to the magnetic disk. The controller controls write operations to a first region and a second region of the magnetic disk in different manners. The second region is narrower in track pitch than the first region.
    Type: Grant
    Filed: September 10, 2020
    Date of Patent: October 19, 2021
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Daigo Nakamura
  • Patent number: 11145329
    Abstract: A recording medium cartridge according to an embodiment of the present technology includes: an information recording medium; a first cartridge memory; and a second cartridge memory. The first cartridge memory is capable of storing first information relating to the information recording medium, and includes a non-contact communication medium capable of reading/writing the first information via a first communication device disposed in a drive device. The second cartridge memory is capable of storing second information relating to the information recording medium, and is configured to be capable of reading the second information via a second communication device.
    Type: Grant
    Filed: March 8, 2019
    Date of Patent: October 12, 2021
    Assignee: Sony Corporation
    Inventors: Kazuo Anno, Eiji Nakashio, Takanobu Iwama, Naohiro Adachi, Shinya Tochikubo, Masayoshi Abe
  • Patent number: 11145331
    Abstract: Systems and methods for adaptation of a two-dimensional magnetic recording (TDMR) channel are provided. Read-back signals from respective read sensors of a TDMR channel are received at an equalizer, the read-back signals corresponding to a digital signal value. A log-likelihood ratio (LLR) signal is generated based at least in part on the read-back signals. A cross-entropy value is generated indicative of a mismatch between a probability of detected bit and a probability of the true recorded bit. The equalizer is adapted by setting an equalizer parameter to a value that corresponds to a minimum cross-entropy value from among the computed cross-entropy value and one or more previously computed cross-entropy values, to decrease a read-back bit error rate for the TDMR channel.
    Type: Grant
    Filed: October 29, 2020
    Date of Patent: October 12, 2021
    Assignee: Marvell Asia Pte, Ltd.
    Inventors: Nitin Nangare, Jinlu Shen
  • Patent number: 11138993
    Abstract: One or more write efficiency metrics are determined. The one or more write efficiency metrics are associated with a tape storage drive while the tape storage drive is operating on one or more tape storage media cartridges to write data sets to the one or more tape storage media cartridges. It is predicted whether the tape storage drive would be able to write an entire set of data sets to a current tape storage media cartridge based on the one or more write efficiency metrics. It is determined whether a different tape storage drive is to be utilized to complete writing of the entire set of data sets to the current tape storage media cartridge based on the prediction.
    Type: Grant
    Filed: December 10, 2020
    Date of Patent: October 5, 2021
    Assignee: Facebook, Inc.
    Inventors: Yu Cai, Chengyan Fu, Haoci Zhang, John Mah
  • Patent number: 11133032
    Abstract: A method includes detecting a read error during a first read operation by a read sensor on a first track on a data storage medium. The method also includes, after the read error is detected, performing a second read operation by the read sensor on the first track, carrying out bit error value (BEV) measurements for the second read operation, and determining, from the BEV measurements, whether the read sensor produces a marginal BEV, which is between first and second predetermined BEV thresholds. In response to determining that the read sensor produces the marginal BEV, a third read operation by the read sensor on the first track is carried out, and BEV measurements for the third read operation are performed. When the BEV measurements from the second and third read operations meet at least one predetermined read sensor instability criterion, it is concluded that the read sensor is unstable.
    Type: Grant
    Filed: October 20, 2020
    Date of Patent: September 28, 2021
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Jung Wook Hur, Lin Thi Lin, Kang Hai Lim, Teng Hou Chua, XueYi Miao, Zhi Ye
  • Patent number: 11127421
    Abstract: A heat-assisted magnetic recording (HAMR) write head has a write pole with a chemically-passivated end that substantially prevents oxidation and thus improves corrosion resistance of the write pole. The write pole and near-field transducer (NFT) are supported on a slider and have their ends in a window region of the slider's disk-facing surface. The outer surface region of the write pole is chemically-passivated, preferably by exposure to a nitrogen plasma. The nitrogen plasma has no effect on the NFT end or on the magnetoresistive read head, which is protected because it is located in a non-window region of the slider's disk-facing surface. An optically transparent protective film is formed in the window over the passivated write pole end and NFT end.
    Type: Grant
    Filed: February 8, 2021
    Date of Patent: September 21, 2021
    Assignee: Western Digital Technologies, Inc.
    Inventors: Krisda Siangchaew, Barry Cushing Stipe, Nattaporn Khamnualthong
  • Patent number: 11127418
    Abstract: A heat-assisted magnetic recording device includes a write pole positionable adjacent a magnetic recording medium and configured to write data to the medium. A near-field transducer is situated proximate the write pole and configured to produce a thermal spot on the medium. A channel circuit is configured to generate a sequence of symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. A write driver is configured to apply bi-directional write currents to the write pole to record the sequence of symbols at a location of the thermal spot on the medium, wherein a duration of applying the write currents to the write pole by the write driver is dependent on a length of the sequence of symbols and the effective thermal spot size.
    Type: Grant
    Filed: November 30, 2020
    Date of Patent: September 21, 2021
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Quan Li
  • Patent number: 11127419
    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: January 5, 2021
    Date of Patent: September 21, 2021
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Quan Li
  • Patent number: 11120832
    Abstract: A recording and reproducing device includes: a reading unit that reads production information from a recording medium of a magnetic tape cartridge, the magnetic tape cartridge including a magnetic tape, and the recording medium other than the magnetic tape and on which the production information is recorded, the production information being information regarding the magnetic tape obtained in a production process of the magnetic tape cartridge; and a control unit that performs, as an initialization process of the magnetic tape cartridge, control of recording the production information on the magnetic tape and invalidating the production information in the recording medium.
    Type: Grant
    Filed: September 16, 2020
    Date of Patent: September 14, 2021
    Assignee: FUJIFILM CORPORATION
    Inventors: Toru Nakao, Hodaka Suzuki, Yoichi Akano
  • Patent number: 11120825
    Abstract: Illustrative systems and methods disclosed herein may change or modify a seek during mid-seek for various reasons and may set seek speeds for various seeks to less than the maximum possible seek speed to, for example, facilitate seek target change or modifications mid-seek. For instance, the seek speeds for lower priority commands or commands at risk for deprioritization may be set to speeds less than the maximum possible seek speed.
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: September 14, 2021
    Assignee: Seagate Technology LLC
    Inventors: Raye A. Sosseh, Brian Thomas Edgar, Josiah Natan Wernow, Paul Michael Wiggins