Patents by Inventor Joseph C. S. Liu

Joseph C. S. Liu 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 employing stream detection engine to enhance cache management policy
    Patent number: 7392340
    Abstract: A disk drive is disclosed comprising a disk, a head actuated over the disk, a host interface for receiving disk access commands from a host, a command queue for queuing the disk access commands, and a stream detection engine for evaluating the disk access commands to detect a plurality of streams accessed by the host. The stream detection engine maintains a stream data structure for each detected stream, wherein the stream data structure comprises a frequency counter for tracking a number of disk access commands associated with the stream out of a predetermined number of consecutive disk access commands received from the host. A disk controller selects one of the streams for servicing in response to the frequency counters.
    Type: Grant
    Filed: March 21, 2005
    Date of Patent: June 24, 2008
    Assignee: Western Digital Technologies, Inc.
    Inventors: Quoc Dang, Joseph C. S. Liu