Patents by Inventor Anthony L. Pei

Anthony L. Pei has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electronic system with data refresh mechanism and method of operation thereof
    Patent number: 9269393
    Abstract: An apparatus includes: a media; a head configured to write data on the media; a read channel, coupled to the head, configured to detect servo data from the media; and control circuitry, coupled to the read channel, configured to: generate a position error signal (PES), associated with a write operation of an aggressor track, from the servo data, compare a first threshold to the PES for detecting a write unsafe condition, compare a second threshold, within the first threshold, to the PES for detecting a write squeeze condition, and control a refresh operation of a victim track based on at least one of the comparisons.
    Type: Grant
    Filed: December 8, 2014
    Date of Patent: February 23, 2016
    Assignee: Western Digital Technologies, Inc.
    Inventors: Steven L. Webb, Chun Sei Tsai, Anthony L. Pei, Carl E. Barlow
  • Hard-disk drive work load profiling and capturing systems and methods
    Patent number: 8793532
    Abstract: The application discloses systems that can include a monitoring module that is operative to provide an event indicator of an event occurring on a hard-disk drive. The systems can include a recording module that is operative to create an event record based on a logging instruction to log the event indicator. The systems can include an event linkage module that is operative to link the event record to a hard-disk drive activity indicator. The systems can include an error log formatting module that is operative to format the event record and a hard-disk drive activity indicator into a hard-disk drive error log. The systems can include a configuration module to set configuration flags and/or values. The error log can be stored on various areas of the hard-disk drive. The application also discloses related methods.
    Type: Grant
    Filed: January 25, 2012
    Date of Patent: July 29, 2014
    Assignee: Western Digital Technologies, Inc.
    Inventors: Chun Sei Tsai, William B. Boyle, Sang Huynh, Anthony L. Pei, Kenneth J. D'Souza
  • Disk drive biasing refresh zone counters based on write commands
    Patent number: 7974029
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of tracks, and a head actuated over the disk. A plurality of refresh zones are defined, wherein each refresh zone corresponds to a plurality of the tracks. Data is written to a first refresh zone, and a first zone counter is updated for a second refresh zone at a first rate. Data is written to a third refresh zone, and the first zone counter is updated for the second refresh zone at a second rate different than the first rate.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: July 5, 2011
    Assignee: Western Digital Technologies, Inc.
    Inventors: Chun Sei Tsai, Sang Huynh, Anthony L. Pei, Don Brunnett, Jahangir John Kasraee, Kent W. Gibbons
  • Disk drive prioritizing in-the-field defect scanning based on number of write operations in each of a plurality of defect zones
    Patent number: 7929234
    Abstract: A disk drive is disclosed comprising a head actuated over a disk, the disk having a plurality of data tracks, wherein a first plurality of data tracks comprises a first plurality of defect scanned data sectors and a second plurality of data tracks comprises a second plurality of unscanned data sectors. The second plurality of data tracks is divided into a plurality of defect zones. A first number of write commands are received from a host to write data to a first defect zone. A first data sector in the first defect zone is defect scanned in response to the first number of write commands to the first defect zone.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: April 19, 2011
    Assignee: Western Digital Technologies, Inc.
    Inventors: William B. Boyle, Chun Sei Tsai, Anthony L. Pei
  • DISK DRIVE BIASING REFRESH ZONE COUNTERS BASED ON WRITE COMMANDS
    Publication number: 20110026159
    Abstract: A disk drive is disclosed comprising a disk comprising a plurality of tracks, and a head actuated over the disk. A plurality of refresh zones are defined, wherein each refresh zone corresponds to a plurality of the tracks. Data is written to a first refresh zone, and a first zone counter is updated for a second refresh zone at a first rate. Data is written to a third refresh zone, and the first zone counter is updated for the second refresh zone at a second rate different than the first rate.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 3, 2011
    Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.
    Inventors: CHUN SEI TSAI, SANG HUYNH, ANTHONY L. PEI, DON BRUNNETT, JAHANGIR JOHN KASRAEE, KENT W. GIBBONS