Patents by Inventor Tomohisa Oyama

Tomohisa Oyama 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).

  • Patent number: 6204984
    Abstract: A disk control section of a disk apparatus comprises an identification section for identifying information regarding a position at which the head positioning servo information is stored, a position calculation unit for calculating the position on a disk medium where recording/reproduction of the record information is to be performed, a comparison and decision unit for comparing the information regarding the position identified by the identification unit with the position information calculated by the position calculation unit each time a predetermined command is received from the higher-level device, and for deciding whether or not the position identified by the identification unit is the position at which the record information is to be recorded on or reproduced, and a skip recording/reproduction unit for carrying out control such that when it is judged, on the basis of the result of the comparison made by the comparison and decision unit, that the position identified by the identification unit is the positi
    Type: Grant
    Filed: July 9, 1999
    Date of Patent: March 20, 2001
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Uno, Tomohisa Oyama
  • Patent number: 6018435
    Abstract: A disk control section of a disk apparatus comprises an identification section for identifying information regarding a position at which head positioning servo information is stored. A position calculation unit calculates the position on a disk medium where recording/reproduction of record information is to be performed. A comparison and decision unit compares the information regarding the position identified by the identification unit with the position information calculated by the position calculation unit each time a predetermined command is received from a higher-level device, and for deciding whether or not the position identified by the identification unit is the position at which the record information is to be recorded on or reproduced.
    Type: Grant
    Filed: January 15, 1997
    Date of Patent: January 25, 2000
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Uno, Tomohisa Oyama
  • Patent number: 5253256
    Abstract: An array disk apparatus capable of identifying locations where data reconstruction has failed. The apparatus comprises a disk controller containing a data reconstructing unit, a "reconstruction unsuccessful" information generating unit and a "reconstruction unsuccessful" information storing unit. The data reconstructing unit reconstructs lost data based on the data from the magnetic disk units other than the failed and repaired unit and on parity data associated with the data. The "reconstruction unsuccessful" information generating unit generates "reconstruction unsuccessful" information if another magnetic disk unit develops a read error during a data reconstruction process. The "reconstruction unsuccessful" data storing unit stores the "reconstruction unsuccessful" information to the failed magnetic disk unit after the repair thereof.
    Type: Grant
    Filed: February 15, 1991
    Date of Patent: October 12, 1993
    Assignee: Fujitsu Limited
    Inventors: Tomohisa Oyama, Yumiko Ohizumi