Patents by Inventor Hisakazu Hironaka

Hisakazu Hironaka 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-shaped recording medium and formatting method thereof wherein historic information including a storage capacity of the disk-shaped recording medium is recorded thereon
    Patent number: 6341045
    Abstract: In a large-capacity FD comprising a disk-shaped recording medium on which a plurality of tracks are arranged with concentric circles, each track is divided into a predetermined number of sectors having a length equal to one another. Each sector consists of a serve field and a data field. The servo field in each sector includes a sector number field in which a sector number and alternation contents of the magnetic disk medium are written and a track number field in which a track number is written. The sectors on each track may be assigned with serial sector numbers in a circumferential direction in order with skipping over any defective sector. The plurality of tracks may be separated in a radial direction into a plurality of zones each including at least one alternate track.
    Type: Grant
    Filed: December 17, 1997
    Date of Patent: January 22, 2002
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Hisakazu Hironaka, Toshiharu Shimizu, Yoshihide Majima, Toshimitsu Itoh, Hidetsugu Touji