Patents by Inventor Yoko Enokida

Yoko Enokida 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).

  • Adaptive skew setting for a disk drive
    Patent number: 6493171
    Abstract: A method of manufacturing a disk drive (10) including determining and implementing skew values for each head (12a-12d) of the disk drive (10) during a production test phase is provided herein. The method for each head (12a-12d) includes initiating a head switch test series, measuring a head switch time, computing an average head switch time, computing a standard deviation of the head switch times, and computing a head skew based on the average and the standard deviation of the head switch times. The method for each head (12a-12d) further includes initiating a single-cylinder seek test, measuring a single-cylinder seek time, computing an average single-cylinder seek time, computing a standard deviation of the single-cylinder seek times, and computing a cylinder skew based on the average and the standard deviation of the single cylinder seek times.
    Type: Grant
    Filed: March 30, 2001
    Date of Patent: December 10, 2002
    Assignee: Maxtor Corporation
    Inventors: Yoko Enokida, Dick Pitzer
  • Adaptive skew settings for a disk drive
    Patent number: 6424485
    Abstract: A method for improving disk drive performance by adaptively calculating skew values for each drive. During a production phase of the disk drive manufacturing process, skew values are calculated using measured seek times, then implemented to each drive. The calculation scheme permits slipped revolutions to occur during a percentage of the time so that skew values are not so high as to hinder high performance.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: July 23, 2002
    Assignee: Maxtor Corporation
    Inventors: Yoko Enokida, Richard D. Pitzer, Karman Tam
  • Adaptive skew setting for a disk drive
    Publication number: 20020060867
    Abstract: A method of manufacturing a disk drive (10) including determining and implementing skew values for each head (12a-12d) of the disk drive (10) during a production test phase is provided herein. The method for each head (12a-12d) includes initiating a head switch test series, measuring a head switch time, computing an average head switch time, computing a standard deviation of the head switch times, and computing a head skew based on the average and the standard deviation of the head switch times. The method for each head (12a-12d) further includes initiating a single-cylinder seek test, measuring a single-cylinder seek time, computing an average single-cylinder seek time, computing a standard deviation of the single-cylinder seek times, and computing a cylinder skew based on the average and the standard deviation of the single cylinder seek times.
    Type: Application
    Filed: March 30, 2001
    Publication date: May 23, 2002
    Inventors: Yoko Enokida, Dick Pitzer