Patents by Inventor Kok Leong Loh

Kok Leong Loh 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).

  • Method and apparatus for determining data field fill-in frequency at servo pack writing
    Patent number: 6798596
    Abstract: A guardband portion is written on a disc surface in a disc drive. A predetermined data pattern is written on at least one data track adjacent to the guardband portion. A predetermined guardband pattern is written at a plurality of different guardband frequencies in the guardband portion. For each guardband frequency, at least one performance criterion is measured for the data track. A desired guardband pattern is written on the guardband portion of the disc surface at a guardband frequency chosen based on the measured performance criterion.
    Type: Grant
    Filed: November 27, 2001
    Date of Patent: September 28, 2004
    Assignee: Seagate Technology LLC
    Inventors: Eng Hock Lim, Quek Leong Choo, Kok Leong Loh, Myint Ngwe, Kah Liang Gan
  • Head instability detection for a data storage device
    Publication number: 20030206358
    Abstract: A method for determining whether a head of a data storage device exhibits head instability. A disc attached to a spindle motor is accelerated to an operating rotational velocity to aerodynamically support the head, the head is positioned over a portion of the disc and a pattern of selected frequency is written. A readback signal is provided to a head instability detection circuit by a magnetoresistive element of the head reading the selected frequency pattern for detection and comparison of an occurrence of randomly repeatable amplitude spikes in relation to predetermined threshold levels.
    Type: Application
    Filed: April 3, 2003
    Publication date: November 6, 2003
    Inventors: David Kok Leong Loh, San Yuan Liew, Xia Lan, Myint Ngwe, Kian Wai Ng
  • System for combining automatic gain control values in a disc drive to perform drive performance operations
    Publication number: 20030053236
    Abstract: A representation of the signal level on a data head is obtained by combining the signal level values corresponding to more than one sector of a track on a disc surface. This makes it much easier to lock on to a relatively accurate representation of the actual head signal amplitude, even in the presence of servo disturbances.
    Type: Application
    Filed: May 22, 2002
    Publication date: March 20, 2003
    Inventors: David Kok Leong Loh, Victor Chew Weng Khin, Quek Leong Choo, Myint Ngwe, KahLiang Gan
  • Method and apparatus for determining data field fill-in frequency at servo pack writing
    Publication number: 20030011921
    Abstract: A guardband portion is written on a disc surface in a disc drive. A predetermined data pattern is written on at least one data track adjacent to the guardband portion. A predetermined guardband pattern is written at a plurality of different guardband frequencies in the guardband portion. For each guardband frequency, at least one performance criterion is measured for the data track. A desired guardband pattern is written on the guardband portion of the disc surface at a guardband frequency chosen based on the measured performance criterion.
    Type: Application
    Filed: November 27, 2001
    Publication date: January 16, 2003
    Inventors: Eng Hock Lim, Quek Leong Choo, Kok Leong Loh, Myint Ngwe, Kah Liang Gan