Patents by Inventor Richard William Hull

Richard William Hull 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 including a recording surface employing servo zones recorded at a channel frequency different from data zones
    Patent number: 6441981
    Abstract: A disk drive includes a disk having a disk surface, the disk surface having a plurality of tracks arranged in an embedded servo format. The disk surface includes a plurality of radially-extending user-data regions and a plurality of radially-extending servo-data regions. Each user-data region has a plurality of data zones in each of which user data are stored in a plurality of track segments at a data channel frequency particular to that data zone. Each servo-data region has a plurality of servo zones in each of which servo data are stored in a plurality of track segments at a servo channel frequency particular to that servo zone, wherein in at least one of the tracks having servo data and user data, the servo channel frequency differs from the data channel frequency.
    Type: Grant
    Filed: May 1, 2001
    Date of Patent: August 27, 2002
    Assignee: Western Digital Technologies, Inc.
    Inventors: Robert Leslie Cloke, Richard William Hull, Vafa James Rakshani, David Price Turner
  • Disk drive including a recording surface employing servo zones with banded data zones
    Patent number: 6262857
    Abstract: A disk drive includes a disk having a disk surface, the disk surface having a plurality of tracks arranged in an embedded servo format. The disk surface includes a plurality of radially-extending user-data regions and a plurality of radially-extending servo-data regions. Each user-data region has a plurality of data zones in each of which user data are stored in a plurality of track segments at a data channel frequency particular to that data zone. Each servo-data region has a plurality of servo zones in each of which servo data are stored in a plurality of track segments at a servo channel frequency particular to that servo zone. The servo channel frequency differs from the data channel frequency for at least one track.
    Type: Grant
    Filed: June 23, 1998
    Date of Patent: July 17, 2001
    Assignee: Western Digital Corporation
    Inventors: Richard William Hull, Vafa James Rakshani, David Price Turner, Robert Leslie Cloke