Patents by Inventor Tomokazu Yokoyama

Tomokazu Yokoyama 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).

  • Publication number: 20050204364
    Abstract: The object of the present invention is to enable device miniaturization and reduced costs for a storage device without a drop in reliability even when a variety of devices are mounted highly densely therein. In order to connect the disk control logic unit 49 and disk drive unit 1, a 2-port control signal cable (571, 57n), which has a constitution in which two port control signal cables (port control signal cable 56 and port control signal cable 58, port control signal cable 60 and port control signal cable 62, for example) of adjacent ports (port 0 and port 1, port n-1 and port n, for example) among (a plurality of) port control signal cables (56, 58, . . . , 60, and 62) are bundled to form one cable, is adopted.
    Type: Application
    Filed: May 20, 2004
    Publication date: September 15, 2005
    Inventors: Hiroshi Suzuki, Hiromi Matsushige, Masato Ogawa, Tomokazu Yokoyama, Testuya Inoue
  • Publication number: 20050149653
    Abstract: The present invention enables the configuration of a disk array device to be changed in accordance with its purpose of use. Plural disk drive groups each comprising plural disk drives 81 are disposed in the same disk drive unit. Respective disk drive groups are connected to respectively different HDD control boards 82. Each HDD control board 82 is disposed with a connection circuit 200 and switch circuits 210. A signal is outputted from a management terminal to switch the switch circuits 210, whereby adjacent HDD control boards 82 can be connected and operated. Also, by switching the switch circuits 210, adjacent HDD control boards 82 can be mutually separated and operated independently.
    Type: Application
    Filed: March 2, 2004
    Publication date: July 7, 2005
    Inventors: Hiroshi Suzuki, Hiromi Matsushige, Masato Ogawa, Tomokazu Yokoyama
  • Publication number: 20050141184
    Abstract: In a RAID system, the power supplied to hard disks (HDDs) can be increased, and a plurality of types of HDDs can be installed. A plurality of HDD packs 33 are supplied with a single high voltage from a motherboard 28. The HDD packs 33 each accommodate, in a canister, an HDD 107, 181, 185 or 187 with different power supply specifications or communication interface specifications, as well as a DC/DC converter 109 to convert the power supply. Part of the HDD packs 33 have a data transfer interface conversion circuit 195 as well.
    Type: Application
    Filed: March 18, 2004
    Publication date: June 30, 2005
    Inventors: Hiroshi Suzuki, Hiromi Matsushige, Masato Ogawa, Tomokazu Yokoyama, Masateru Kurokawa
  • Publication number: 20040236906
    Abstract: The present invention relates to a storage unit comprising: a channel control portion for receiving a data input/output request; a cache memory for storing data; a disk control portion for performing input/output processing on data in accordance with the data input/output request; and a plurality of disk drives for storing data, wherein at least two of the disk drives input data to and output it from the disk control portion at different communication speeds. Further, the storage unit has a plurality of communication paths provided to connect at least one of the disk drives in such a manner as to constitute a loop defined by the FC-AL fiber channel standards, so that the communication speeds can be set differently for these different communication paths.
    Type: Application
    Filed: August 28, 2003
    Publication date: November 25, 2004
    Inventors: Hiromi Matsushige, Hiroshi Suzuki, Masato Ogawa, Tomokazu Yokoyama, Yasuhiro Sakakibara
  • Publication number: 20040068670
    Abstract: A disk array device and a method of supplying power to a disk array device to which power is supplied by at least two AC inputs are provided. Where at least two AC/DC power-supply groups are provided in correspondence with each of the AC inputs and each AC/DC power-supply group includes at least two AC/DC power supplies that are connected to the AC input corresponding to that group, outputs from the AC/DC power supplies are summed separately for each group to obtain group total outputs for each group, and the group total outputs are input to each of a plurality of loads in the disk array device to provide power to each of the loads.
    Type: Application
    Filed: June 16, 2003
    Publication date: April 8, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Hiroshi Suzuki, Hiromi Matsushige, Masato Ogawa, Tomokazu Yokoyama
  • Publication number: 20030217300
    Abstract: A disk array device having two or more disk units, each disk unit including at least one disk drive, at least either of said disk units having parity bits carrying data recovery information, comprises at least one backup battery provided for each of said disk unit.
    Type: Application
    Filed: April 29, 2003
    Publication date: November 20, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Mitsuo Fukumori, Hiroshi Suzuki, Hiromi Matsushige, Masato Ogawa, Tomokazu Yokoyama
  • Publication number: 20030200471
    Abstract: A power source control apparatus for a disk subsystem includes a plurality of hard disk drives (HDDs) each with two systems of fiber channel interface ports, an HDD drive section, and an HDD control logic section. The HDD drive section includes two systems of fiber channel control sections, each of which includes a fiber channel interface and a fiber channel control interface. The HDD control logic section includes two systems of HDD control logics that control read/write accesses to the HDDs. Fiber channel control signals are supplied from the HDD control logics to the fiber channel control interfaces, respectively, and the fiber channel control signals are also used to control the power source of the HDD drive section.
    Type: Application
    Filed: March 6, 2003
    Publication date: October 23, 2003
    Applicant: HITACHI, LTD.
    Inventors: Hiroshi Suzuki, Hiromi Matsushige, Masato Ogawa, Tomokazu Yokoyama