General Recording Or Reproducing Patents (Class 360/55)
  • Patent number: 11295774
    Abstract: A data storage device is disclosed comprising a first head actuated radially over a first disk surface, and a second head actuated radially over a second disk surface. A seek operation seeks the first head to a first fly height calibration track and seeks the second head to a second fly height calibration track. During a revolution of the first and second disk surfaces the first head is used to read the first fly height calibration track in order to calibrate a first fly height actuator for the first head, and after switching from the first head to the second head, the second head is used to read the second fly height calibration track in order to calibrate a second fly height actuator for the second head.
    Type: Grant
    Filed: June 11, 2021
    Date of Patent: April 5, 2022
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventor: Sandy Xianghui Xiao
  • Patent number: 11295768
    Abstract: A spin transfer torque reversal assisted magnetic recording (STRAMR) writer is disclosed wherein a spin torque oscillator has a flux guiding layer (FGL) wherein magnetization flips to a direction substantially opposing the write gap (WG) field when sufficient current (IB) density is applied across the STO between a trailing shield and main pole (MP) thereby enhancing the MP write field. A key feature is that the FGL has a center portion with a larger magnetization saturation×thickness (MsT) than in FGL outer portions proximate to STO sidewalls. Accordingly, lower IB density is necessary to provide a given amount of FGL magnetization flipping and there is reduced write bubble fringing compared with writers having a FGL with uniform MsT. Lower MsT is achieved by partially oxidizing FGL outer portions. In some embodiments, there is a gradient in outer FGL portions where MsT increases with increasing distance from FGL sidewalls.
    Type: Grant
    Filed: September 23, 2020
    Date of Patent: April 5, 2022
    Assignee: Headway Technologies, Inc.
    Inventors: Ying Liu, Shohei Kawasaki, Wenyu Chen, Yuhui Tang
  • Patent number: 11284844
    Abstract: A system includes a processor in communication with a set of bioelectrical sensors and a user interface device that provides functionality to monitor one or more bioelectrical signals from a set of bioelectrical electrodes. Processor automatically adjusts a selected one of: (i) a resting threshold; and (ii) a switch threshold that is greater than the resting threshold based at least in part on a trend of the bioelectrical signal. The processor determines whether an amplitude of the bioelectrical signal is less than the resting threshold. In response to determining that the amplitude is less than the resting threshold, the processor determines whether an amplitude of the bioelectrical signal subsequently is equal to or greater than the switch threshold. In response to determining that the bioelectrical signal is greater than the switch threshold, the processor triggers the user interface device with a switch signal.
    Type: Grant
    Filed: November 16, 2018
    Date of Patent: March 29, 2022
    Assignee: Control Bionics Holdings Pty Ltd.
    Inventors: James E. Schorey, Peter S. Ford, Robert W. Wong
  • Patent number: 11276427
    Abstract: A recording and reproducing apparatus includes: a magnetic head in which a servo band having a servo pattern and a data band having data tracks are alternately arranged along a width direction, the magnetic head including a recording and reproducing element that records or reproduces data with respect to the data track, and at least two servo reproducing elements that read servo patterns adjacent to each other in the width direction of the magnetic tape; a selection unit that selects a servo reproducing element from the servo reproducing elements according to a position of the data track, as a target of recording or reproducing of data in the data band, along the width direction; and a controller that controls positioning of the magnetic head along the width direction by using a result of reading of the servo patterns by the servo reproducing element selected by the selection unit.
    Type: Grant
    Filed: August 31, 2020
    Date of Patent: March 15, 2022
    Assignee: FUJIFILM CORPORATION
    Inventor: Toru Nakao
  • Patent number: 11227646
    Abstract: According to one embodiment, a device includes a member including a first portion having a first dimension in first direction, a second portion spaced from the first portion and having a second dimension in the first direction, a third portion between the first and second portions and having a third dimension in the first direction, and a fourth portion between the first and third portions and having a fourth dimension in the first direction; and a circuit to supply a shift pulse including first and second pulses to the member and move a domain wall in the member. The third dimension is less than the first dimension. The second and fourth dimensions are less than the third dimension. A second value of the second pulse is less than a first value of the first pulse.
    Type: Grant
    Filed: September 11, 2020
    Date of Patent: January 18, 2022
    Assignee: KIOXIA CORPORATION
    Inventors: Masahiro Koike, Michael Arnaud Quinsat, Nobuyuki Umetsu, Tsutomu Nakanishi, Yasuaki Ootera, Tsuyoshi Kondo
  • 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: 11120822
    Abstract: A magnetic disk drive includes first and second disks having respective first and second surfaces, a first head including a first write head that writes data on the first surface at a first recording density, and a first assist element that generates a first energy for increasing a write performance by the first write head, a second head including a second write head that writes data on the second surface at a second recording density, and a second assist element that generates a second energy for increasing a write performance by the second write head, and a controller that changes one of the first and second recording densities based on a first recording capacity up to which the first head is capable of writing on the first disk, a second recording capacity up to which the second head is capable of writing on the second disk, and a target capacity.
    Type: Grant
    Filed: August 26, 2020
    Date of Patent: September 14, 2021
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Masaya Ohtake, Akihiko Takeo
  • Patent number: 11056134
    Abstract: An apparatus includes a write pole that stores data on tracks on a data storage medium. The apparatus also includes side shields on first and second sides of the write pole, and a trailing shield above the write pole and above the side shields. The apparatus further includes a microwave assisted magnetic recording oscillator having conductive pads that form capacitors with portions of a conductive film of the data storage medium. The conductive pads are positioned on a medium-facing surface of a slider that includes the write pole, the side shields and the trailing shield.
    Type: Grant
    Filed: December 20, 2019
    Date of Patent: July 6, 2021
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Walter R. Eppler
  • Patent number: 11031039
    Abstract: A preamplifier that that is configured for optimizing the write current waveform to achieve the best areal density capability (ADC) and adjacent track interference (ATI) performance of a magnetic recording disk drive. The preamplifier is configured for providing a magnetic head write current with a main pole relaxation zone for providing a buffer zone for main pole relaxation from saturation state to a remanence state before writing the next bit. The preamplifier is further configured for providing a magnetic head write current with a reference main pole relaxation current located at an end region data of each bit. The length of the reference main pole relaxation current is a function of the bit length, frequency, recording velocity, and writer/media switching speed.
    Type: Grant
    Filed: August 19, 2020
    Date of Patent: June 8, 2021
    Assignee: Headway Technologies, Inc.
    Inventors: Yuhui Tang, Ying Liu
  • Patent number: 10943621
    Abstract: A method for designing an enclosure using an idealized hard drive disk (HDD) vibration threshold datasets for an experimental enclosure, where the enclosure is a modified version of the experimental enclosure. The method includes generating HDD vibration threshold datasets, obtaining HDD performance datasets based on the HDD vibration threshold datasets and historical enclosure vibration datasets, comparing the HDD performance datasets to the historical HDD performance datasets, calculating fitness scores for each of the HDD vibration threshold datasets based on the comparison, and designating, based on the fitness scores, an HDD vibration threshold dataset of the HDD vibration threshold datasets as the ideal HDD vibration threshold dataset.
    Type: Grant
    Filed: July 10, 2020
    Date of Patent: March 9, 2021
    Assignee: Dell Products L.P.
    Inventor: Daniel J. Carey
  • Patent number: 10872015
    Abstract: A data storage system can connect a plurality of remote hosts to a plurality of die sets resident in a semiconductor memory. Execution of at least one data access command addressed by a remote host of the plurality of remote hosts can occur prior to a power interruption event being detected for at least one die set of the plurality of die sets. User-generated data associated with the at least one data access command may then be flushed to a predetermined location responsive to an available resource budget associated with the power interruption event.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: December 22, 2020
    Assignee: Seagate Technology LLC
    Inventors: Stacey Secatch, Steven S. Williams, David W. Claude, Benjamin J. Scott, Kyumsung Lee, Jeff Rogers
  • 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: 10825287
    Abstract: A gaming system including an isolating partially see through sound blocking multi-function isolating enclosure and an electronic gaming machine positioned in the enclosure.
    Type: Grant
    Filed: March 11, 2019
    Date of Patent: November 3, 2020
    Assignee: IGT
    Inventors: Wopei Feng, Xuan Liu, Mo Fang, Yongqiang Jin
  • Patent number: 10817217
    Abstract: A data storage system can divide a semiconductor memory into a plurality of die sets prior to populating a die set queue with data access commands addressed by a remote host and having a first order. A command order strategy generated by a time-to-ready module organizes the data access commands to a second order that populate a channel queue and are executed as directed by the time-to-ready module in the second order.
    Type: Grant
    Filed: June 28, 2018
    Date of Patent: October 27, 2020
    Assignee: Seagate Technology LLC
    Inventors: Steven S. Williams, David W. Claude
  • Patent number: 10734023
    Abstract: A tape drive, according to one embodiment, includes: a processor, and logic which is integrated with the processor, executable by the processor, or integrated with and executable by the processor. The logic is configured to: determine whether a difference between information and corresponding design values is in a range. The information corresponds to how an array of writers write and/or are expected to write to a magnetic medium during shingled recording. Moreover, the logic is configured to: compute, using the information, data describing a lateral writing position to use during writing such that shingled track edges are aligned according to a format in response to determining that the difference between the information and corresponding design values is not in the range.
    Type: Grant
    Filed: May 23, 2019
    Date of Patent: August 4, 2020
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, W. Stanley Czarnecki, Ernest S. Gale, Jason Liang
  • Patent number: 10699031
    Abstract: In an example, transactions are secured between electronic circuits in a memory fabric. An electronic circuit may receive a transaction integrity key. The electronic circuit may compute a truncated message authentication code (MAC) using the received transaction integrity key and attach the truncated MAC to a security message header (SMH) of the transaction.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: June 30, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Liqun Chen, Chris I. Dalton, Fraser John Dickin, Nigel Edwards, Simon Kai-Ying Shiu
  • Patent number: 10691750
    Abstract: Features are disclosed for efficiently maintaining information regarding content navigation history and state of a browser application. The browser application can use a portion of a client device's non-persistent memory that has been assigned a direct byte-for-byte correlation with a file in persistent storage, such as a memory-mapped file. The browser application can access, store, and update information in the memory-mapped file in non-persistent memory without being responsible for ensuring that updates are also reflected in the file stored in persistent storage. The operating system of the client device can handle the tasks of writing to, and reading from, persistent storage.
    Type: Grant
    Filed: September 28, 2015
    Date of Patent: June 23, 2020
    Assignee: Amazon Technologies, Inc.
    Inventor: Jari Juhani Karppanen
  • Patent number: 10684952
    Abstract: According to one embodiment, a disk medium rotates in a first rotation state when access is given, and rotates in a second rotation state lower in rotation number than the first rotation state when access is not given. A controller receives, from a host device, a read command for reading first data stored in a first buffer, when the disk medium is in the second rotation state. The controller transmits the first data from the first buffer to the host device, without causing a shift into the first rotation state, and then shifts the disk medium into the first rotation state after completion of execution of the read command.
    Type: Grant
    Filed: August 31, 2018
    Date of Patent: June 16, 2020
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Kimiyasu Aida, Hidekazu Masuyama, Katsushi Ohta, Hirotaka Iima, Takumi Kakuya, Takato Kuji, Yuji Karakawa, Kenji Inoue
  • Patent number: 10650874
    Abstract: A magnetic memory device includes a magnetic element and a write circuit electrically connected to two nodes of the magnetic element and configured to provide a write current to the magnetic element, wherein the write current includes a first current having a first peak applied for a first time period and a second current having a second peak applied for a second time period, where the second peak is smaller than the first peak and the second period is longer than the first time period.
    Type: Grant
    Filed: October 4, 2017
    Date of Patent: May 12, 2020
    Assignees: SK hynix Inc., Industry-Academic Cooperation Foundation, Yonsei University
    Inventors: Sachin Pathak, Kangwook Jo, Jongil Hong, Hongil Yoon
  • Patent number: 10629253
    Abstract: A semiconductor package for performing a reset operation includes a first semiconductor device including a first resistor element coupled to a reset pin, the first semiconductor device configured to be applied with a reset signal through the reset pin such that the reset operation is performed. The semiconductor package includes a second semiconductor device including a second resistor element coupled to the reset pin, the second semiconductor device configured to be applied with the reset signal through the reset pin such that the reset operation is performed. The first resistor element and the second resistor element may be selectively coupled to the reset pin when the reset operation is performed.
    Type: Grant
    Filed: July 24, 2018
    Date of Patent: April 21, 2020
    Assignee: SK hynix Inc.
    Inventors: Keun Soo Song, Hongjoo Song, Hae Kang Jung
  • Patent number: 10523820
    Abstract: A first request to form a conference call is received from a first of a plurality of electronic devices. In response to the first request, a conference data structure is generated in a memory. Based on determining the conference call has ended, a second request is transmitted to each of the plurality of electronic devices to return a high-resolution video stream generated by each electronic device during the conference call. In response to the second requests, the high-resolution video stream is received from at least some of the plurality of electronic devices. Each of the received high-resolution video streams is stored in the conference data structure in the memory to generate a completed conference data structure. A notice that the completed conference data structure is available is transmitted to each of the plurality of electronic devices.
    Type: Grant
    Filed: May 29, 2018
    Date of Patent: December 31, 2019
    Assignee: Apple Inc.
    Inventors: Christopher M. Garrido, Eric L. Chien, Wenhui Xu, Xiaoxiao Zheng, Spencer E. Lewson, Keith W. Rauenbuehler, Komei Harada, Ming Jin, Gurtej Singh G. Chandok, David L. Biderman
  • Patent number: 10499812
    Abstract: A system and method for applying a uniform dynamic gain over cardiac data with the aid of a digital computer is provided. A time series of a plurality of voltage values that comprises a digital representation of a raw electrocardiography (“ECG”) signal recorded by an ambulatory monitor recorder is obtained by an least one computer processor, the time series including segments of noise and segments of non-noise. The segments of non-noise are analyzed by the at least one computer processor and a single gain factor for all of the values in the analyzed non-noise segments is determined by the at least one computer processor based on the analysis. The single gain factor to all of the values in the non-noise segments is applied by the at least one computer processor.
    Type: Grant
    Filed: August 20, 2018
    Date of Patent: December 10, 2019
    Assignee: Bardy Diagnostics, Inc.
    Inventors: Gust H. Bardy, Jason Felix, Jon Mikalson Bishay, Ezra M. Dreisbach
  • Patent number: 10490220
    Abstract: Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %, and ?SFD (=SFD25°C.?SFD?190° C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFD25° C. being SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD?190° C. being SFD measured at a temperature of ?190° C.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: November 26, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10482912
    Abstract: A magnetic recording medium includes a recording surface comprising a first recording layer having a first ferromagnetic resonant frequency and a second recording layer having a second ferromagnetic resonant frequency. The first recording layer is configured for storing user data and the second recording layer configured for storing servo data. A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer. The recording head arrangement comprises a write pole configured to generate a write magnetic field, and a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency. A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers.
    Type: Grant
    Filed: January 16, 2019
    Date of Patent: November 19, 2019
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Lihong Zhang, PengBoon Khoo
  • Patent number: 10475477
    Abstract: A tape cartridge according to one aspect includes a tape formatted with a timing-based servo pattern having at least two servo tracks thereon. The tape cartridge also includes a persistent memory device 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. The persistent memory device also stores environmental condition data and drive condition data pertaining to the average distance. Various methods for using such a tape cartridge are also disclosed.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: November 12, 2019
    Assignee: International Business Machines Corporation
    Inventor: Robert G. Biskeborn
  • Patent number: 10446186
    Abstract: Apparatus for data storage in a cartridge library archival system. In some embodiments, a plurality of portable data storage cartridges are provided. Each cartridge has a sealed housing which encloses at least one head-disc interface (HDI) with a magnetic data transducer adjacent a rotatable data recording medium. An access station has control electronics configured to transfer data signals between a memory and the transducer of a selected cartridge loaded to the access station. The access station further has an external voice coil motor (VCM) configured to engage and advance the transducer of the selected cartridge across a recording surface of the medium. A transport mechanism can be used to automatically load the cartridges to the access station. Multiple cartridges can be loaded sequentially or concurrently to support various data transfer operations.
    Type: Grant
    Filed: September 19, 2018
    Date of Patent: October 15, 2019
    Assignee: Seagate Technology LLC
    Inventors: Riyan Alex Mendonsa, Jason Bryce Gadbois, Tim Rausch, Brett R. Herdendorf, Krishnan Subramanian
  • Patent number: 10438622
    Abstract: The magnetic tape device includes a magnetic tape; and a servo head, in which the servo head is a TMR head, the magnetic tape includes a servo pattern in the magnetic layer, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and a ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster thereof in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: October 8, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10412183
    Abstract: An electronic device accesses a listening history of a user of a media-providing service, and for each characteristic of a set of characteristics describing tracks provided by the media-providing service, determines a measure of divergence with respect to listening contexts for the listening history of the user. The electronic device identifies a characteristic that has a respective measure of divergence that satisfies a threshold indicative of a lack of uniformity in the listening history with respect to the listening contexts. The electronic device determines a representative value of the identified characteristic for a listening context corresponding to a current listening context of the user. The electronic device provides personalized content to a client device of the user based on the current listening context and representative value of the identified characteristic.
    Type: Grant
    Filed: August 23, 2017
    Date of Patent: September 10, 2019
    Assignee: Spotify AB
    Inventors: Clay Gibson, Will Shapiro, Santiago Gil, Ian Anderson, Margreth Mpossi, Oguz Semerci, Scott Wolf
  • Patent number: 10397698
    Abstract: Provided is an audio device, including: an audio signal communication unit comprising a reception unit configured to receive an audio signal via wireless communication and a transmission unit configured to transmit an audio signal via wireless communication; a plurality of signal input units including the reception unit; an input selection unit configured to select one signal input unit from among the plurality of signal input units; a control unit configured to control switching of the input selection unit; and a signal processing unit, in which the control unit is configured to: switch, when the input selection unit has selected a signal input unit other than the reception unit, the input selection unit to the selected signal input unit and input an audio signal, which is input from the selected signal input unit, into the signal processing unit; and switch, when the reception unit has received an audio signal via wireless communication, the input selection unit from the selected signal input unit to the re
    Type: Grant
    Filed: July 18, 2017
    Date of Patent: August 27, 2019
    Assignee: Yamaha Corporation
    Inventors: Katsuaki Tanaka, Masahiro Ishida
  • Patent number: 10388311
    Abstract: A computer-implemented method, according to one embodiment, includes: determining, by the computer, whether a difference between information and corresponding design values is in a range. The information corresponds to how an array of writers write and/or are expected to write to a magnetic medium during shingled recording. Moreover, the computer-implemented method further includes: computing, by the computer and using the information, data describing a lateral writing position to use during writing such that shingled track edges are aligned according to a format in response to determining that the difference between the information and corresponding design values is not in the range.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: August 20, 2019
    Assignee: International Business Machines Corporation
    Inventors: Robert G. Biskeborn, W. Stanley Czarnecki, Ernest S. Gale, Jason Liang
  • Patent number: 10379765
    Abstract: Command scheduling for die sets of non-volatile memory may be performed based on command states of the die sets. Upon receiving an erase command to erase data stored in a first block set of non-volatile memory, a command state of the first die set of the non-volatile memory is determined, where the first die set contains the first block set. If the first die set is determined to be in a pending command state, the erase command is queued in a wait queue. If the first die set is determined to be in an idle command state, the erase command is scheduled to erase the data stored in the first block set.
    Type: Grant
    Filed: August 15, 2017
    Date of Patent: August 13, 2019
    Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: YungLi Ji, Yun-Tzuo Lai, Haining Liu, Yuriy Pavlenko
  • Patent number: 10360928
    Abstract: A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of tracks. A plurality of interlaced recording (IR) zones are defined on the disk, wherein each IR zone comprises a plurality of top tracks partially overlapping a plurality of bottom tracks. First data is written to the bottom tracks of a first IR zone, and the first IR zone is identified as a cold IR zone that is storing cold data. In response to identifying the first IR zone as a cold IR zone, second data is written to the top tracks of the first IR zone.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: July 23, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventor: Richard M. Brockie
  • Patent number: 10332557
    Abstract: A servo sector on a disk is read via first and second readers that both span two or more user data tracks. The servo sector has a crosstrack width that spans the two or more user data tracks. The first reader provides a first signal based on detecting a total longitudinal field of the servo sector. The second reader provides a second signal based on detecting a total perpendicular field of the servo sector. A position error of the first and second readers is detected using. A value of the first signal can be used to detect a position error, detect a track-to-track phase error, and/or detect a Gray code error of a track ID field of the servo sector.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: June 25, 2019
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, Puskal Prasad Pokharel, Walter R. Eppler
  • Patent number: 10319904
    Abstract: A magnetoresistance effect element has a first ferromagnetic metal layer, a second ferromagnetic metal layer, and a tunnel barrier layer that is sandwiched between the first and second ferromagnetic metal layers, and the tunnel barrier layer has a spinel structure represented by a composition formula of AIn2Ox (0<x?4), and an A-site is a non-magnetic divalent cation which is one or more selected from a group consisting of magnesium, zinc and cadmium.
    Type: Grant
    Filed: March 29, 2016
    Date of Patent: June 11, 2019
    Assignee: TDK CORPORATION
    Inventors: Tomoyuki Sasaki, Katsuyuki Nakada, Tatsuo Shibata
  • Patent number: 10276208
    Abstract: A data storage device is disclosed comprising a head actuated over a disk surface comprising a first magnetic recording layer and a second magnetic recording layer. Data is encoded into a codeword comprising a plurality of non-binary symbols wherein each symbol represents one of a plurality of symbol values comprising a first symbol value, a second symbol value, and a third symbol value. The first symbol value is written to the disk surface by magnetizing the first and second magnetic recording layers, and the second symbol value is written to the disk surface by magnetizing the first magnetic recording layer without substantially affecting the magnetization of the second magnetic recording layer. The encoding into the codeword codes out at least one sequence of symbol values to prevent an ambiguity between detecting the first symbol value and the second symbol value during a read operation.
    Type: Grant
    Filed: May 25, 2018
    Date of Patent: April 30, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Zhigang Bai, Yaguang Wei, Terence Tin Lok Lam, Kuok San Ho, Lijie Guan
  • Patent number: 10249332
    Abstract: A magnetic recording medium includes a recording surface comprising a first recording layer having a first ferromagnetic resonant frequency and a second recording layer having a second ferromagnetic resonant frequency. The first recording layer is configured for storing user data and the second recording layer configured for storing servo data. A recording head arrangement is configured for microwave-assisted magnetic recording (MAMR) and writing user data to the first recording layer. The recording head arrangement comprises a write pole configured to generate a write magnetic field, and a write-assist arrangement proximate the write pole. The write-assist arrangement is configured to generate a radiofrequency assist magnetic field at a frequency that corresponds to the first ferromagnetic resonant frequency. A reader of the recording head arrangement is configured to read combined signals from the first and second recording layers.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: April 2, 2019
    Assignee: Seagate Technology LLC
    Inventors: Xiong Liu, Lihong Zhang, PengBoon Khoo
  • Patent number: 10244423
    Abstract: A chunk-based scheduling method and a chunk-based scheduling apparatus, capable of improving Quality of Service (QoS) upon the occurrence of congestion in a wireless communication system are provided. The method includes requesting, by a terminal, from a base station for chunk-based scheduling which uses an available bit rate bearer so as to receive chunk that constitutes traffic, and receiving, from the base station, at least one chunk scheduled based on the time limit information of the chunk.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: March 26, 2019
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Ji-Cheol Lee, Hyung-Ho Lee, Sung-Ho Choi
  • Patent number: 10141013
    Abstract: According to one embodiment, a magnetic disk device including a disk, a head, and a controller which sets a first track pitch based on fringing when a second track is written, sets a second track pitch based on fringing when a third track is written, calculates a difference between the first track pitch and the second track pitch, sets, when the difference is less than or equal to a reference value, an area to which the first track is written in a first recording area, and sets, when the difference is greater than the reference value, the area to which the first track is written in a second recording area.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: November 27, 2018
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Shunsuke Aoki
  • Patent number: 10134433
    Abstract: Provided is a magnetic tape device in which a magnetic tape transportation speed is equal to or lower than 18 m/sec, Ra measured regarding a surface of a magnetic layer of a magnetic tape is equal to or smaller than 2.0 nm, a C-H derived C concentration calculated from a C-H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %, and ?SFD (=SFD25° C.?SFD?190° C.) in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, with the SFD25° C. being SFD measured in a longitudinal direction of the magnetic tape at a temperature of 25° C., and the SFD?190° C. being SFD measured at a temperature of ?190° C.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: November 20, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10068598
    Abstract: Systems and methods for compensating for hysteresis in a disc drive are described. In one embodiment, a method may use an inverse hysteresis model to linearize effects of hysteresis of a microactuator in the disc drive. The hysteresis model may be a Coleman-Hodgdon hysteresis model. The hysteresis of the microactuator may be characterized, and the inverse hysteresis model may be based at least in part on the characterization. The inverse hysteresis model may be used to implement a digital filter. The digital filter may be employed in series with the microactuator to linearize the effects of hysteresis.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: September 4, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Reed D. Hanson, Kenneth A. Haapala, Dwight R. Kinney, Xinghui Huang
  • Patent number: 10062399
    Abstract: Some embodiments are directed to tape drive systems that oscillate the relative transverse position of the tape and magnetic head during seek operations (for example, by moving the head in the transverse direction). Some embodiments are directed to tape drive systems that select relative transverse position of the tape and magnetic head to counter uneven wear (for example, observed uneven wear, uneven wear predicted based on historical tape and drive usage data).
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: August 28, 2018
    Assignee: International Business Machines Corporation
    Inventors: Marcus Breuer, Bernd Freitag, Frank Krick, Tim Oswald
  • Patent number: 10037167
    Abstract: A non-volatile memory system may include a controller that issues data transfer commands to have data units associated with a host read request transferred from non-volatile memory to a temporary storage area before the data is sent to a host. The controller may be configured to generate a schedule that identifies when the data transfer commands are issued. The schedule may be generated according to one of a plurality of scheduling schemes, each with a different priority in having the data units transferred to the temporary storage area. Which scheduling scheme the controller selects may depend on a queue depth of a read request queue.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: July 31, 2018
    Assignee: SanDisk Technologies LLC
    Inventors: Hyuk-il Kwon, YouMe Lee, SeungBeom Seo, DongHoon Lee, ByongJun Shin
  • Patent number: 10027743
    Abstract: According to one embodiment, a connection control device includes a request acceptor to accept a connection destination determination request transmitted from a first communication device; and a determiner to determine a server being a connection destination of the first communication device from among a plurality of servers. At least one first server among the servers is scheduled to stop running at a first time point. The determiner determines the connection destination of the first communication device in accordance with a number of communication devices connected to each of the servers, based on history information on connection durations by the first communication device with the servers or history information on connection durations by communication devices with the first server, so that a number of the communication devices connected to the first server before the first time point arrives is suppressed.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: July 17, 2018
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroshi Kawazoe, Daisuke Ajitomi, Keisuke Minami
  • Patent number: 10025534
    Abstract: Implementations disclosed herein include a method comprising receiving a TRIM request for a media cache in a storage media from a host, determining whether a TRIM range in the TRIM request overlaps with an active operation, invalidating the TRIM range responsive to determining that the TRIM range does not overlap with an active operation, and inserting at least one null node in the media cache. The method may comprise receiving a host read request, performing a media cache search for a read LBA range, and determining where data is located. If all the data is located in the media cache, the system reads from the media cache. If the data is located in a null node, patterning for the null node occurs. If the data is located partially in the main store, the media cache, or a null node, the data may be read, combined, and returned to the host.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: July 17, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Yan Naing, Harry Tiotantra, PohGuat Bay, Thein Than Zaw, CheeHou Peng
  • Patent number: 10008230
    Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which the servo head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder, a binding agent, and fatty acid ester on the non-magnetic support, the magnetic layer includes a servo pattern, full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 7.0 nm, and a difference between a spacing measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 9.0 nm.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: June 26, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Tetsuya Kaneko, Norihito Kasada
  • Patent number: 10002625
    Abstract: A recording head has a first magnetic writer and a second magnetic writer offset from the first magnetic writer in a downtrack and crosstrack direction. The recording head has leads configured to deliver respective first and second write and/or laser currents to the first and second writers. The first and second write and/or laser currents enable the first and second writers to simultaneously write to adjacent tracks of a magnetic disk.
    Type: Grant
    Filed: February 14, 2017
    Date of Patent: June 19, 2018
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventor: Mehmet Fatih Erden
  • Patent number: 9997193
    Abstract: A drive-implemented method according to one embodiment includes determining that unthreading of a tape is to be performed, and in response to the determination that the unthreading of the tape is to be performed, determining whether to write an index on the tape prior to unthreading the tape. In response to a determination to write the index on the tape, the index is written on the tape prior to unthreading the tape. The tape is then unthreaded.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: June 12, 2018
    Assignee: International Business Machines Corporation
    Inventors: Tohru Hasegawa, Masayuki Iwanaga, Yutaka Oishi
  • Patent number: 9984716
    Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a TMR head, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, the magnetic layer includes one or more components selected from the group consisting of fatty acid and fatty acid amide, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on a surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 45 to 65 atom %.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: May 29, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Tetsuya Kaneko, Norihito Kasada, Eiki Ozawa
  • Patent number: 9978414
    Abstract: The magnetic tape device includes: a magnetic tape; and a servo head, in which a magnetic tape transportation speed of the magnetic tape device is equal to or lower than 18 m/sec, the servo head is a magnetic head including a tunnel magnetoresistance effect type element as a servo pattern reading element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder, non-magnetic powder, and a binding agent on the non-magnetic support, the magnetic layer includes a servo pattern, and a tilt cos ? of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 0.95.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: May 22, 2018
    Assignee: FUJIFILM Corporation
    Inventors: Tetsuya Kaneko, Norihito Kasada, Eiki Ozawa
  • Patent number: 9952780
    Abstract: An input to read two or more data records stored to a tape medium on a tape drive is received. A starting point is determined. The starting point is a closest data record, of the two or more data records, to a current position of a tape head of the tape drive. A read order of the two or more data records is determined. The read order is determined using an algorithm and the determined starting point. The determined read order is sent to a host device. A first data record is determined. A first locate operation within the tape drive is performed. The first data record, of the two or more data records stored on the tape medium, based on the determined read order is read. The first data record, of the two or more data records stored on the tape medium, is sent to the host device.
    Type: Grant
    Filed: June 28, 2016
    Date of Patent: April 24, 2018
    Assignee: International Business Machines Corporation
    Inventors: Kousei Kawamura, Koichi Masuda, Sosuke Matsui, Yutaka Oishi, Takahiro Tsuda