Patents by Inventor Masaki Makifuchi

Masaki Makifuchi 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).

  • Slew-rate control device, storage device, and slew-rate control method
    Patent number: 7667909
    Abstract: A slew-rate control device controls a slew rate of a control signal based on which data reading or data writing is performed with respect to a storage medium. A retry executing unit changes, when an error occurs during the data reading or the data writing, the slew rate of the control signal, and executes a retry of the data reading or the data writing. A slew-rate setting unit sets, as the slew rate of the control signal, a slew rate with which the retry is successfully executed.
    Type: Grant
    Filed: January 12, 2007
    Date of Patent: February 23, 2010
    Assignee: Toshiba Storage Device Corporation
    Inventor: Masaki Makifuchi
  • Disk controlling apparatus and computer product
    Patent number: 7606129
    Abstract: A disk apparatus writes and rewrites data in a storage disk and reads data from the storage disk. A disk controlling apparatus that controls the disk apparatus includes an environment information creating unit creates environment information that is related to an environment of the disk apparatus, a storing unit that appends the environment information to the data that is to be written to the storage disk, and a rewrite process determining unit determines whether to execute a rewrite process based on the environment information in the data read from the storage disk.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: October 20, 2009
    Assignee: Fujitsu Limited
    Inventors: Yukio Urata, Masaki Makifuchi
  • Slew-rate control device, storage device, and slew-rate control method
    Publication number: 20080062552
    Abstract: A slew-rate control device controls a slew rate of a control signal based on which data reading or data writing is performed with respect to a storage medium. A retry executing unit changes, when an error occurs during the data reading or the data writing, the slew rate of the control signal, and executes a retry of the data reading or the data writing. A slew-rate setting unit sets, as the slew rate of the control signal, a slew rate with which the retry is successfully executed.
    Type: Application
    Filed: January 12, 2007
    Publication date: March 13, 2008
    Inventor: Masaki Makifuchi
  • Disk testing apparatus, disk testing method, computer-readable recording medium that stores a disk testing program, and disk apparatus including a disk to be tested
    Patent number: 7248040
    Abstract: A disk testing apparatus that sets a predetermined condition of a recording density for a disk apparatus, and conducts a test relating to at least readout of data stored in the disk apparatus includes a condition relaxing unit that relaxes, when a result of the test is unsatisfactory, a condition of the recording density currently set for the disk apparatus to set a new condition of the recording density; and a re-testing unit that re-conducts the test on the disk apparatus to which the new condition is set.
    Type: Grant
    Filed: December 27, 2004
    Date of Patent: July 24, 2007
    Assignee: Fujitsu Limited
    Inventors: Masaki Makifuchi, Shigenori Yanagi
  • Disk controlling apparatus and computer product
    Publication number: 20060140068
    Abstract: A disk apparatus writes and rewrites data in a storage disk and reads data from the storage disk. A disk controlling apparatus that controls the disk apparatus includes an environment information creating unit creates environment information that is related to an environment of the disk apparatus, a storing unit that appends the environment information to the data that is to be written to the storage disk, and a rewrite process determining unit determines whether to execute a rewrite process based on the environment information in the data read from the storage disk.
    Type: Application
    Filed: March 23, 2005
    Publication date: June 29, 2006
    Inventors: Yukio Urata, Masaki Makifuchi
  • Disk testing apparatus, disk testing method, computer product, and disk apparatus
    Publication number: 20060061356
    Abstract: A disk testing apparatus that sets a predetermined condition of a recording density for a disk apparatus, and conducts a test relating to at least readout of data stored in the disk apparatus includes a condition relaxing unit that relaxes, when a result of the test is unsatisfactory, a condition of the recording density currently set for the disk apparatus to set a new condition of the recording density; and a re-testing unit that re-conducts the test on the disk apparatus to which the new condition is set.
    Type: Application
    Filed: December 27, 2004
    Publication date: March 23, 2006
    Inventors: Masaki Makifuchi, Shigenori Yanagi