Patents by Inventor Kek Ming Chua

Kek Ming Chua 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).

  • Disk drive adjusting a defect threshold when scanning for defective sectors
    Patent number: 9042045
    Abstract: A disk drive is disclosed including a disk having a plurality of sectors, and a head actuated over the disk. A defect threshold is initialized, and a first sector is read to generate a first read signal. The first read signal is processed to detect a defect in the first sector relative to the defect threshold. After detecting the defect, the defect threshold is adjusted and the first sector is reread to generate a second read signal. The second read signal is processed to detect the defect in the first sector relative to the adjusted defect threshold.
    Type: Grant
    Filed: November 1, 2007
    Date of Patent: May 26, 2015
    Assignee: Western Digital Technologies, Inc.
    Inventors: Dean V. Dang, Kek Ming Chua, King S. Goh, Prakash Balasubramaniam, Ming Jin
  • Method of alternating track write for defect identification
    Patent number: 7839588
    Abstract: Defects are identified in a disk drive by first writing a pattern of tracks to a disk surface in the disk drive, the pattern of tracks including written tracks alternating with unwritten tracks. The written tracks of the pattern of tracks are read, and a defect in a portion of a first written track is detected. An unread portion of a first unwritten track is then identified as comprising a defect based at least in part on the defect in the first written track, the first unwritten track located proximate the first written track.
    Type: Grant
    Filed: May 18, 2008
    Date of Patent: November 23, 2010
    Assignee: Western Digital Technologies, Inc.
    Inventors: Dean V. Dang, Kek Ming Chua, Philip Bernard Saram, William J. Seamon