Patents by Inventor Choon Wei Ng

Choon Wei Ng 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).

  • Implementation of variable bit density recording in storage disc drives
    Patent number: 6560052
    Abstract: The present invention pertains to an apparatus and method for recording data in a variable bit density disc drive. The disc drive includes a recording surfaces, each having a corresponding head for recording data on the recording surface. At least one head is operated at a different recording frequency from the other heads, creating a variable bit density for the different recording surfaces. The combination of head recording frequencies is determined following an error testing operation and a unique physdisc lookup table is created based on the determined recording frequencies. The physdisc lookup table is used to allocate data sectors and to convert between logical and physical block addresses.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: May 6, 2003
    Assignee: Seagate Technology LLC
    Inventors: Wei Loon Ng, Beng Wee Quak, Wing Hung Chan, Swee Kieong Choo, Choon Wei Ng, Teck Khoon Lim
  • IMPLEMENTATION OF VARIABLE BIT DENSITY RECORDING IN STORAGE DISC DRIVES
    Publication number: 20020141099
    Abstract: The present invention pertains to an apparatus and method for recording data in a variable bit density disc drive. The disc drive includes a recording surfaces, each having a corresponding head for recording data on the recording surface. At least one head is operated at a different recording frequency from the other heads, creating a variable bit density for the different recording surfaces. The combination of head recording frequencies is determined following an error testing operation and a unique physdisc lookup table is created based on the determined recording frequencies. The physdisc lookup table is used to allocate data sectors and to convert between logical and physical block addresses.
    Type: Application
    Filed: July 12, 1999
    Publication date: October 3, 2002
    Inventors: WEI LOON NG, BENG WEE QUAK, WING HUNG CHAN, SWEE KIEONG CHOO, CHOON WEI NG, TECK KHOON LIM