Patents Examined by Tan X Dinh
  • Patent number: 10381040
    Abstract: A write command is received to write data in a Conventional Magnetic Recording (CMR) realm of a disk to be formatted for writing data in non-overlapping tracks. The disk includes a plurality of areas of the disk that can be formatted as a CMR realm or as a Shingled Magnetic Recording (SMR) realm formatted for writing data in overlapping tracks. It is determined whether performance of the write command would require writing to begin in a portion of the CMR realm that has not been written with non-overlapping tracks. In response to determining that the performance of the write command would require writing to begin in a portion of the CMR realm that has not been written with non-overlapping tracks, a predefined data pattern is written using non-overlapping tracks in the portion of the CMR realm that has not been written with non-overlapping tracks.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: August 13, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: William B. Boyle, Shad H. Thorstenson
  • Patent number: 10366726
    Abstract: A first set of bottom tracks is written via a first head that is moved via a first actuator over a surface of a disk. A second set of top tracks interlaced between and partially overlapping the bottom tracks via a second head that is moved via a second actuator over the surface of the disk independently of the first actuator and first head.
    Type: Grant
    Filed: March 29, 2018
    Date of Patent: July 30, 2019
    Assignee: Seagate Technology LLC
    Inventors: Steven Douglas Granz, Mehmet Fatih Erden
  • Patent number: 10366722
    Abstract: An apparatus comprises a laser diode configured to generate modulated light during a write operation in response to receiving modulated current having a mean amplitude that varies or is constant. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A writer heater of the slider is configured to receive power during the write operation having a magnitude that varies or is constant. A sensor is situated on or within the slider. The sensor is configured to produce a sensor signal representative of output optical power of the laser diode. Measuring circuitry is coupled to the sensor and configured to measure a change in the sensor signal indicative of a laser mode hop during the write operation.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: July 30, 2019
    Assignee: Seagate Technology LLC
    Inventors: Riyan Mendonsa, James Dillon Kiely, Joshua Ward Christensen, Jon D. Trantham, Chad Robert Barry, Tim Rausch
  • Patent number: 10366721
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, an XRD intensity ratio Int(110)/Int(114) obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and an edge shape of the timing-based servo pattern specified by magnetic force microscope observation is a shape in which a difference (L99.9?L0.1) is equal to or smaller than 180 nm, and a magnetic tape device including the magnetic tape.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: July 30, 2019
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 10354683
    Abstract: A control device, a method of controlling the control device and recording medium are provided. Ranges of movement of a plurality of servo control systems are effectively used. A controller generates a corrected trajectory in which a high frequency component is removed from a first inverse kinematics trajectory so that no phase delay occurs as a command trajectory of a first servo control system.
    Type: Grant
    Filed: February 13, 2018
    Date of Patent: July 16, 2019
    Assignee: OMRON Corporation
    Inventors: Masaki Namie, Yukio Iname, Mikiko Manabe
  • Patent number: 10348220
    Abstract: A PWM modulation circuit controls low-side transistors of three phases to all be in an ON state when a brake current flows; controls, in a period in which a brake current flows in a first direction in one phase, a transistor for sensing in that one phase to be in an ON state; and controls, in a period in which a brake current flows in the first direction in two phases, transistors for three phases to be in an OFF state. When the brake current is to flow, sense-phase control circuits for the three phases control a transistor for sensing, in a phase in which the brake current flows in a sink direction, to be into an ON state, and controls the transistor for sensing in a phase in which the brake current flows in an opposite direction, to be into an OFF state.
    Type: Grant
    Filed: June 11, 2018
    Date of Patent: July 9, 2019
    Assignee: RENESAS ELECTRONICS CORPORATION
    Inventors: Minoru Kurosawa, Seigi Ishiji
  • Patent number: 10339971
    Abstract: In one embodiment, a system includes a magnetic head having a plurality of write transducers and a plurality of read transducers. Each read transducer is configured to read data from a sequential access medium after being written thereto by a corresponding write transducer. The system also includes a controller and logic integrated with and/or executable by the controller. The logic is configured to read, using the plurality of read transducers, encoded data from a plurality of tracks of the sequential access medium simultaneously. The logic is also configured to determine that one or more tracks of the sequential access medium are dead within a sliding window. Moreover, the logic is configured to rewrite a set of encoded data from the one or more dead tracks to live tracks in a rewrite area of the sequential access medium. Other systems, methods, and computer program products are described according to more embodiments.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: July 2, 2019
    Assignee: International Business Machines Corporation
    Inventors: Kevin D. Butt, Roy D. Cideciyan, Simeon Furrer, Mark A. Lantz
  • Patent number: 10339963
    Abstract: Pseudorandom bit sequences are recorded to a heat-assisted recording medium at a laser power that is stepped while recording the pseudorandom bit sequences. The pseudorandom bit sequences are read from the heat-assisted recording medium to determine timing differences between bits written before and after the laser power is stepped. A thermal gradient of bits written to the heat-assisted recording medium is determined based on the timing differences.
    Type: Grant
    Filed: July 2, 2018
    Date of Patent: July 2, 2019
    Assignee: Seagate Technology LLC
    Inventors: Drew Michael Mader, Ian James Gilbert, Walter R. Eppler, Tim Rausch
  • Patent number: 10325619
    Abstract: A method of forming a recording head for use with a data storage medium in a data storage device. The method includes forming first and second writers of different target geometries. A first recording measurement is performed on one or more storage media using the first writer. A second recording measurement is performed on the one or more storage media using the second writer. Based on a comparison of the first and second recording measurements to a predetermined quantity, either the first writer or the second writer is selected to be operational in the data storage device.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: June 18, 2019
    Assignee: Seagate Technology LLC
    Inventors: Kurt Wiesen, Javier Guzman, Joseph Mundenar, Michael Conover
  • Patent number: 10325630
    Abstract: An electronic device that includes an external storage medium connection unit to which an external storage medium is connected; a detection unit that detects whether or not demonstration data is stored in the external storage medium connected to the external storage medium connection unit; and an operation mode control unit that causes the device to operate in a demonstration mode in a case where the demonstration data is stored in the external storage medium connected to the external storage medium connection unit, and causes the device to operate in a normal mode in a case where the external storage medium is not connected to the external storage medium connection unit and no demonstration data is stored in the external storage medium connected to the external storage medium connection unit.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: June 18, 2019
    Assignee: ONKYO CORPORATION
    Inventors: Takahiro Suzuki, Taiki Fujii
  • Patent number: 10319397
    Abstract: Narrow band dwell occurs when air bearings corresponding to a set of read and/or write heads within a hard disc drive remain within a fixed narrow band of one or more storage platters for an extended period of time. The air bearings displace lubricant on the storage platters and may redeposit the lubricant as droplets on the platters. The presently disclosure technology is directed to monitoring a hard disc drive for narrow band dwell, and in some implementations, implementing operations to mitigate narrow band dwell. More specifically, the presently disclosure technology may detect an overflying air-bearing slider position, apply a lubrication film displacement formula to a narrow band of the storage platter, apply a lubrication film reflow formula to one or more other narrow bands of the storage platter, and track lubrication film thickness over time in each of the narrow bands of the storage platter.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: June 11, 2019
    Assignee: SEAGATE TECHNOLOGY LLC
    Inventors: Scott E. Ryun, Brian R. Pollock, Ryan Todd Lyle, Ryan Thomas Herbison, Richard Arthur Herr, Paul W. Burnett
  • Patent number: 10319405
    Abstract: Embodiments described herein provide an apparatus that is operable with a storage system. The storage system includes a controller operable to assign a pointer to a first track of a magnetic disk when data is written to the first track. The pointer points to the end of the data in the first track. The controller is also operable to detect a successive write to an earlier written portion of the first track, to update a location of the pointer based on the successive write to the earlier written portion of the first track, to increment a write count of the first track based on the successive write to the earlier written portion of the first track, and to rewrite a track adjacent to the first track when the write count breaches a threshold number.
    Type: Grant
    Filed: March 28, 2018
    Date of Patent: June 11, 2019
    Assignee: Seagate Technologies LLC
    Inventors: Chris R. Fulkerson, Abhay T. Kataria
  • Patent number: 10321244
    Abstract: Disclosed herein, among other things, are systems and methods for eavesdropping on a data stream for hearing assistance devices. One aspect of the present subject matter includes a hearing assistance system for a wearer including a Bluetooth host device having a transmitter configured to send data including one or more encoded audio streams, and a data channel having an advertisement that includes frequency information, frequency hop sequences, information for decoding audio streams, and security keys for decoding audio stream information. The system also includes one or more Bluetooth slave devices identified by the Bluetooth host device. The Bluetooth slave devices are configured to actively participate in a connection with the host device to aid the host transmitter in deciding which frequencies to use for frequency hopping and in determining which frequencies are being interfered with and should not be included in a channel map, according to various embodiments.
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: June 11, 2019
    Assignee: Starkey Laboratories, Inc.
    Inventor: Jeffrey Paul Solum
  • Patent number: 10311905
    Abstract: A method is disclosed for establishing a fly height parameter for a hard disc drive. The method includes receiving a set of testing data associated with the hard disc drive and subjecting the hard disc drive to a fly-height test at a first, nominal temperature to generate fly-height data. Based on the set of testing data and the fly-height data, the method includes predicting the hard disc drive's fly-height data for a fly-height test at a second temperature different from the first, nominal temperature. The method further includes establishing the fly-height parameter for the hard disc drive in response to the fly-height data and the predicted fly-height data.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: June 4, 2019
    Assignee: Seagate Technology LLC
    Inventors: ChengYi Guo, Sheng Yuan Lin, Teck Khoon Lim, Teck Hoon Chua
  • Patent number: 10304480
    Abstract: Described is a tape library system that generally comprises a plurality of tape drives and a data bus that links a host computer system to a first tape drive address and a second tape drive address. However, the first tape drive address points to a first controller and switch system that assumes the identity of one of the tape drives. The first controller and switch system is linked to a first tape drive adapted to cooperate with a first type of tape cartridge and a second tape drive adapted to cooperate with second type of tape cartridge. The second tape drive address points to a second controller and switch system that assumes the identity of a different one of the tape drives. The second controller and switch system is linked to a third tape drive adapted to cooperate with the first type of tape cartridge and a third tape drive adapted to cooperate with the second type of tape cartridge.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: May 28, 2019
    Assignee: Spectra Logic Corporation
    Inventor: Matthew Thomas Starr
  • Patent number: 10304489
    Abstract: An example tape drive includes a magnetic tape head, an actuator, and a controller. The magnetic tape head includes a data write element to write a data track including data onto magnetic tape. The data track includes a non-trimming portion and a trimmable portion. The magnetic tape head also includes a data read element to read the data written to the non-trimming portion of the data track to verify the accuracy of the data. The controller positions the magnetic tape head via the actuator to allow (i) the data write element to write the first data track, and (ii) the data read element to read the second portion of the first data track. From the read data, a determination may be made as to whether the data was written to the non-trimming portion of the data track with a threshold level of accuracy.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: May 28, 2019
    Inventors: Carl R. Hoerger, Geoffrey Stiles, Martin Dyer, Geoffrey Spratt, Jeffrey S. McAllister, Malcolm Grimwood
  • Patent number: 10297282
    Abstract: A slider configured for heat-assisted magnetic recording comprises a magnetic writer, a near-field transducer, and an optical waveguide coupling the near-field transducer to a light source. The writer is situated proximate the near-field transducer at an air bearing surface of the slider and comprises a first return pole, a second return pole, and a write pole situated between and spaced apart from the first return pole and the second return pole. A structural element is situated at or near the air bearing surface between the write pole and one of the first and second return poles. The structural element comprises a cavity. A thermal sensor is disposed in the cavity. The thermal sensor is configured for sensing contact between the slider and a magnetic recording medium, asperities of the medium, and output optical power of the light source.
    Type: Grant
    Filed: July 25, 2018
    Date of Patent: May 21, 2019
    Assignee: Seagate Technology LLC
    Inventor: James Gary Wessel
  • Patent number: 10283146
    Abstract: According to one embodiment, a system includes a head, where the head includes: an optical signal source configured to emit a first optical signal, and a near-field transducer (NFT) configured to focus the first optical signal on a moving ferroelectric storage medium positioned below the head. The system also includes a detector operatively coupled to the head, where the detector is configured to detect a second optical signal generated in and reflected from the ferroelectric storage medium, and where the second optical signal has twice the optical frequency as the first optical signal.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: May 7, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Takuya Matsumoto, Barry C. Stipe, Ikuya Tagawa, Roger W. Wood
  • Patent number: 10283149
    Abstract: A Data Storage Device (DSD) includes a magnetic storage medium and a head configured to read and write data using a current default write policy that affects an amount of power output by at least one write-assistive component of the head. One or more experimental writes are performed by writing data on the magnetic storage medium using an experimental write policy for the at least one write-assistive component, and the data is read from the magnetic storage medium. An experimental performance of the one or more experimental writes is evaluated based on the reading of the data. An experimental prediction value is determined indicating a predicted usable life of the head based on the evaluation of the experimental performance. Based on the experimental prediction value, it is determined whether to change the current default write policy for the at least one write-assistive component for future non-experimental writes.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: May 7, 2019
    Assignee: Western Digital Technologies, Inc.
    Inventors: Bernd Lamberts, Classica Jain, Remmelt Pit
  • Patent number: 10283152
    Abstract: A recording head includes a waveguide configured to deliver light from a light source to a media-facing surface of the recording head. A near-field transducer is at the media-facing surface the proximate the waveguide. The near-field transducer includes a plasmonic structure with at least two opposing internal surfaces. A dielectric material fills a region between the at least two opposing internal surfaces. A dielectric slit extends between the at least two opposing internal surfaces. The dielectric slit is substantially parallel to the media-facing surface and includes a transparent material with a refractive index different than that of the dielectric material.
    Type: Grant
    Filed: June 12, 2018
    Date of Patent: May 7, 2019
    Assignee: Seagate Technology LLC
    Inventors: Chubing Peng, James Gary Wessel, Lien Lee