Patents by Inventor Masahiro Yuasa

Masahiro Yuasa 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).

  • Magnetic disk drive device
    Patent number: 5379166
    Abstract: In a magnetic disk drive device comprises a magnetic disk having a plurality of concentric tracks on a data surface on which data are recorded. At least one of the tracks serves as a shipping area. Dedicated data is written in each of the data sectors in the shipping area and a DC erase section is formed in one of the data sectors in the shipping area. The dedicated data and the DC erase section are detected at the time of starting the rotation of the magnetic disk, and the speed of the disk is measured on the basis of the data thus obtained. The speed as obtained from the above data is monitored to determined when it has reached a predetermined value.
    Type: Grant
    Filed: November 6, 1991
    Date of Patent: January 3, 1995
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Mitsuyoshi Tsukada, Masahiro Yuasa