Patents by Inventor David J. Bezinque

David J. Bezinque 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).

  • Disc memory servo indexing system
    Patent number: 4956727
    Abstract: A servo disc in a magnetic disc drive has pulses recorded in frames in concentric data tracks. Each frame includes first and second sync pulse groups of at least one sync pulse each, a first track alignment signal (Quad) following the first sync group, and a second track alignment signal (Sig) following the second sync group. A Guard Band and a data Track Zero are identified by eliminating one sync pulse in selected members of frames. Circuitry including monostable multivibrator, flip-flops, and gates identify the Guard Band and Track Zero.
    Type: Grant
    Filed: February 6, 1989
    Date of Patent: September 11, 1990
    Assignee: Seagate Technology, Inc.
    Inventors: David J. Bezinque, James O. Jacques
  • Disc drive error mapping using threshold comparison methods
    Patent number: 4949036
    Abstract: An apparatus and method for testing a variety of hard disk drives is disclosed. The apparatus includes a computer connected to a control board and an interface board. The interface board is connected to a testing board. The hard disk drive is connected to the control board and testing board. The hard disk is tested by first erasing a track of data bits at full write current in one direction or polarity and second erasing the track at minimal write current in the opposite direction. The track is read and compared to a predetermined threshold and any level exceeding the threshold is considered defective.
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: August 14, 1990
    Assignee: Seagate Technology, Inc.
    Inventors: David J. Bezinque, Mark R. McCornack, Michael E. Hammersley