Patents by Inventor Yoshihiro Nakao

Yoshihiro Nakao 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).

  • Method for reliably positioning a head in a disk drive to a guard band area
    Patent number: 5903411
    Abstract: A storage device includes a predetermined number of disks on which servo information is recorded, and a predetermined number of heads. The heads are positioned on target cylinders on the basis of the servo information read from the disks through the heads, so that information recording/reproducing can be performed. The disks include outer guard band areas located further out than data areas and inner guard band areas located further in than the data area. Analysis information concerning disk surfaces are recorded on the outer guard band areas. Each of the outer guard band areas is segmented into first and second outer guard band areas in a radial direction. The analysis information is recorded on the first outer guard band area. The servo information for an off-track correction is recorded on the second outer guard band area.
    Type: Grant
    Filed: February 12, 1996
    Date of Patent: May 11, 1999
    Assignee: Fujitsu Limited
    Inventors: Isamu Tomita, Tatsuro Sasamoto, Yoshihiro Nakao