Patents by Inventor Makoto Tsurumi

Makoto Tsurumi 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 and apparatus for redundant disk storage system with offset
    Patent number: 5887128
    Abstract: A redundant disk storage system having data stored on one disk and identical data on second disk, wherein the data stored on the second disk is in a different radial location determined by an offset. The offset could be such that the data on the first disk is stored near the inner circumference and the identical data is stored on the second disk near the outer circumference. Moreover, a RAM associated with each disk drive which stores the address and offset eliminates a RAM in the main disk controller.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: March 23, 1999
    Assignee: International Business Machines Corporation
    Inventors: Hiroyuki Iwasa, Hiroaki Okumiya, Akira Takeshita, Makoto Tsurumi