Patents by Inventor Yusuke Izumizawa

Yusuke Izumizawa 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).

  • STORAGE DEVICE AND METHOD FOR SAVING WRITE CACHE DATA
    Publication number: 20170046261
    Abstract: According to one embodiment, a storage device includes a nonvolatile storage medium, a volatile memory and a controller. The volatile memory includes a cache area and a cache management area. The cache area is used to store, as write cache data, write data to be written to a user data area of the nonvolatile storage medium. The cache management area is used to store management information associated with the write cache data and including a compression size for the write cache data. The compression size is calculated in accordance with reception of a write command. The controller compresses, based on the management information, write cache data which is not saved to a save area and is needed to be compressed, and writes the compressed write cache data to the save area.
    Type: Application
    Filed: December 10, 2015
    Publication date: February 16, 2017
    Inventors: Michihiko Umeda, Yusuke Izumizawa, Nobuhiro Sugawara, Seiji Toda
  • STORAGE DEVICE AND METHOD FOR SAVING WRITE CACHE DATA
    Publication number: 20170046260
    Abstract: According to one embodiment, a storage device includes a nonvolatile storage medium, a volatile memory and a controller. The volatile memory includes a cache area and a cache management area. The cache area is used to store, as write cache data, write data to be written to a user data area of the nonvolatile storage medium. The cache management area is used to store management information associated with the write cache data and including a compression size for the write cache data. The compression size is calculated in accordance with reception of a write command. The controller compresses, based on the management information, write cache data which is not saved to a save area and is needed to be compressed, and writes the compressed write cache data to the save area.
    Type: Application
    Filed: December 8, 2015
    Publication date: February 16, 2017
    Inventors: Michihiko Umeda, Yusuke Izumizawa, Nobuhiro Sugawara, Seiji Toda
  • MAGNETIC DISK DEVICE AND METHOD FOR EXECUTING SYNCHRONIZE COMMAND
    Publication number: 20160350231
    Abstract: According to one embodiment, a magnetic disk device includes a disk, a volatile memory, and a controller. The disk includes a save area and a user data area. The volatile memory includes a cache area and a cache management area. The cache area is used to store, as write cache data, write data specified by a write command to be written to the user data area. The cache management area is used to store management records for the write cache data. The controller writes write cache data indicated by the management record and not having been written to the user data area, to the save area in accordance with a synchronize command.
    Type: Application
    Filed: August 26, 2015
    Publication date: December 1, 2016
    Inventors: Michihiko Umeda, Yusuke Izumizawa, Nobuhiro Sugawara, Hidekazu Masuyama