Patents by Inventor James M. Dervin

James M. Dervin 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).

  • Patent number: 6643084
    Abstract: A method and system for adaptively limiting an off-track recovery displacement of a recording head during an off-track data recovery operation. A head disk assembly (HDA) includes an actuator that positions the recording head in accordance with an actuator control signal. First, an off-track recover displacement threshold is determined utilizing an off-track data field which overlays an on-track data field. The recording head is displaced with respect to the track center until the on-track data field is read. The relative displacement required to retrieve the on-track data is utilized as the threshold. In response to a failed read attempt, a data recovery procedure commences whereby the recording head is incrementally displaced from the track center while attempting to recover the data. During the DRP, the predetermined off-track recovery threshold is utilized to limit the head displacement such that the input/output (I/O) data integrity of the off-track recovery is ensured.
    Type: Grant
    Filed: April 20, 2000
    Date of Patent: November 4, 2003
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: Au Hoan Andrew, James M. Dervin, Theofilos G. Fkiaras, Xiaoyu Sui