Patents by Inventor Nobuhiro Sugawara

Nobuhiro Sugawara 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: 10841087
    Abstract: The present invention relates to a security device which performs processes such as authentication or cryptography, for example a security device for securely holding a key used in a cryptographic process, and a security method therefore.
    Type: Grant
    Filed: November 5, 2015
    Date of Patent: November 17, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hisashi Fukuda, Takeshi Yoneda, Nobuhiro Kobayashi, Daisuke Suzuki, Manabu Misawa, Koichi Shimizu, Takeshi Sugawara
  • Patent number: 9710197
    Abstract: According to one embodiment, A storage device includes a magnetic disk, a head, and a control unit. The magnetic disk includes a plurality of physical sectors having a first length. A logical block having a second length shorter than the first length, and a redundant area having a length of the difference between the first length and the second length are assigned for the physical sectors. The head reads the data from the physical sector of the magnetic disk. The control unit controls to change the second length of the logical block while maintaining the first length of the physical sector in response to reception of a change request for changing the second length of the logical block from a host.
    Type: Grant
    Filed: September 3, 2015
    Date of Patent: July 18, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Michihiko Umeda, Hidekazu Masuyama, Nobuhiro Sugawara, Yasuyuki Nagashima, Seiji Toda, Takato Kuji
  • 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
  • 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
  • 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
  • Publication number: 20160291879
    Abstract: According to one embodiment, A storage device includes a magnetic disk, a head, and a control unit. The magnetic disk includes a plurality of physical sectors having a first length. A logical block having a second length shorter than the first length, and a redundant area having a length of the difference between the first length and the second length are assigned for the physical sectors. The head reads the data from the physical sector of the magnetic disk. The control unit controls to change the second length of the logical block while maintaining the first length of the physical sector in response to reception of a change request for changing the second length of the logical block from a host.
    Type: Application
    Filed: September 3, 2015
    Publication date: October 6, 2016
    Inventors: Michihiko Umeda, Hidekazu Masuyama, Nobuhiro Sugawara, Yasuyuki Nagashima, Seiji Toda, Takato Kuji
  • Publication number: 20160034330
    Abstract: According to one embodiment, there is provided an information-processing device which includes a storage medium and a controller configured to acquire a delay time in access to storage area included in the storage medium for every storage area with reference to a time at which an access is performed without performing retrying on the storage area based on first information relating to an access history with respect to the storage area, and to determine the storage area of which the delay time exceeds a predetermined allowable delay time as a defective area.
    Type: Application
    Filed: December 10, 2014
    Publication date: February 4, 2016
    Inventors: Tetsuo Kuribayashi, Michihiko Umeda, Hironori Kanno, Nobuhiro Sugawara, Seiji Toda
  • Patent number: 9235472
    Abstract: According to one embodiment, a drive array apparatus includes a plurality of data storage drives constituting a drive array and a controller. The controller divides all data storage areas of each of the data storage drives into a plurality of logical unit areas and associates and manages each of the logical unit areas and each of the data storage drives. The controller identifies a logical unit area of an error occurrence object based on a notification from a data storage drive where an error occurred, restores data of the identified logical unit area, and performs reconfiguration processing of the drive array.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: January 12, 2016
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Nobuhiro Sugawara, Hironori Kanno, Yasuyuki Nagashima, Seiji Toda, Kotaro Yamamoto, Masahide Kanegae, Keiichi Yorimitsu
  • Publication number: 20150234607
    Abstract: According to one embodiment, a disk drive includes a data-save control unit configured to, when a decrease of power is detected, save data in a volatile memory to a non-volatile memory using a backup power source. The disk drive further includes a command processing unit configured to, when new data is stored in the volatile memory, when a data amount of unsaved data, which has not been saved in a disk media memory, exceeds a backup data amount that can be saved from the volatile memory to the non-volatile memory, save the unsaved data to the disk media memory.
    Type: Application
    Filed: June 25, 2014
    Publication date: August 20, 2015
    Inventors: Michihiko Umeda, Masakazu Kitahara, Seiji Toda, Yuusuke Izumizawa, Nobuhiro Sugawara
  • Publication number: 20150046633
    Abstract: According to one embodiment of the present invention, a cache control method of a storage device is provided, the storage device including: a storage unit that stores data, and a buffer memory having a first cache area and a second cache area serving as a cache of the storage unit. The cache control method according to the embodiment includes: storing data read from the storage unit in the first cache area in response to a read command from a host; moving retried data, on which a read retry has occurred upon the readout from the storage unit, to the second cache area from the first cache area in order that the retried data amount in the second cache area is not more than a predetermined data amount; and transferring data in the first cache area or the second cache area to the host.
    Type: Application
    Filed: January 22, 2014
    Publication date: February 12, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tetsuo Kuribayashi, Hironori Kanno, Nobuhiro Sugawara, Yoshinori Inoue, Yasuyuki Nagashima
  • Patent number: 8879192
    Abstract: An information recording device includes a recording medium that includes a data area, and a controller that controls recording of data on the recording medium, wherein in response to a request for execution of formatting of the data area of the recording medium, the controller does not record data for the formatting in the data area and records format information about the formatting in a nonvolatile recording area that is different from the data area.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: November 4, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Nobuhiro Sugawara, Hidekazu Masuyama, Hironori Kanno, Kenji Ogawa, Tetsuo Kuribayashi, Seiji Toda
  • Patent number: 8879181
    Abstract: According to one embodiment, a read/write apparatus includes a receiver and a refresh module. The receiver receives a write command requesting a write to a magnetic disk. The refresh module refreshes, when a first area of the magnetic disk includes a second area corresponding to the write command, data written in a third area, the third area being an area obtained by excluding the second area from the first area.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: November 4, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Seiji Toda, Michio Yamamoto, Masakazu Kitahara, Masataka Shitara, Takumi Kakuya, Kiyotaka Sasaki, Isao Fujita, Satoru Adachi, Kenji Inoue, Nobuhiro Sugawara, Hironori Kanno
  • Publication number: 20140304547
    Abstract: According to one embodiment, a drive array apparatus includes a plurality of data storage drives constituting a drive array and a controller. The controller divides all data storage areas of each of the data storage drives into a plurality of logical unit areas and associates and manages each of the logical unit areas and each of the data storage drives. The controller identifies a logical unit area of an error occurrence object based on a notification from a data storage drive where an error occurred, restores data of the identified logical unit area, and performs reconfiguration processing of the drive array.
    Type: Application
    Filed: September 4, 2013
    Publication date: October 9, 2014
    Inventors: Nobuhiro Sugawara, Hironori Kanno, Yasuyuki Nagashima, Seiji Toda, Kotaro Yamamoto, Masahide Kanegae, Keiichi Yorimitsu
  • Patent number: 8736994
    Abstract: According to one embodiment, a disk storage apparatus includes a first storage device, a second storage device, and a controller. The first storage device stores data for use in determining influence imposed on tracks peripheral to a designated track in which data should be written on a disk. The second storage device has a nonvolatile cache area for temporarily storing data. The controller performs a cache process of storing the data in the nonvolatile cache area if the influence is determined, from the data, to exceed a reference value, in preparation for writing the data in the designated track.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: May 27, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Nobuhiro Sugawara
  • Publication number: 20140071559
    Abstract: According to one embodiment, a read/write apparatus includes a receiver and a refresh module. The receiver receives a write command requesting a write to a magnetic disk. The refresh module refreshes, when a first area of the magnetic disk includes a second area corresponding to the write command, data written in a third area, the third area being an area obtained by excluding the second area from the first area.
    Type: Application
    Filed: January 7, 2013
    Publication date: March 13, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Seiji TODA, Michio YAMAMOTO, Masakazu KITAHARA, Masataka SHITARA, Takumi KAKUYA, Kiyotaka SASAKI, Isao FUJITA, Satoru ADACHI, Kenji INOUE, Nobuhiro SUGAWARA, Hironori KANNO
  • Publication number: 20140022661
    Abstract: According to one embodiment, a disk storage apparatus includes a first storage device, a second storage device, and a controller. The first storage device stores data for use in determining influence imposed on tracks peripheral to a designated track in which data should be written on a disk. The second storage device has a nonvolatile cache area for temporarily storing data. The controller performs a cache process of storing the data in the nonvolatile cache area if the influence is determined, from the data, to exceed a reference value, in preparation for writing the data in the designated track.
    Type: Application
    Filed: December 10, 2012
    Publication date: January 23, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Nobuhiro SUGAWARA
  • Publication number: 20090303628
    Abstract: A magnetic disk device regularly monitors an abnormality in heads and, when detecting an abnormality in any head, transfers data in each cell corresponding to the head where the abnormality is detected to a replacement cell corresponding to another head. Then, in a management table, the magnetic disk device updates the logical address of the transfer-destination cell to the logical address of the transfer-source cell. Thereafter, the magnetic disk device deletes the data in the transfer-destination cell from the management table.
    Type: Application
    Filed: February 24, 2009
    Publication date: December 10, 2009
    Applicant: FUJITSU LIMITED
    Inventors: Nobuhiro Sugawara, Michio Yamamoto
  • Patent number: 6920011
    Abstract: To solve the conventional problem in a disk drive unit that frequent interruptions be produced in a processor each time a head transits on a servo gate. To cope with the above-mentioned problem, a head drive unit 17 performs an off-track check using servo information read by the head 2 whenever the head 2 transits on each servo gate. Thus, an interruption processing required by the processor 16 is limited to the cases of either an operation completion interruption which is produced when a read/write operation is completed normally, or an error interruption which is produced on occurrence of the off-track or read error. This enables to reduce the number of interruption processing times performed in the processor 16, which results in reducing the load of the processor 16.
    Type: Grant
    Filed: August 29, 2003
    Date of Patent: July 19, 2005
    Assignee: Fujitsu Limited
    Inventor: Nobuhiro Sugawara
  • Publication number: 20040090696
    Abstract: To solve the conventional problem in a disk drive unit that frequent interruptions be produced in a processor each time a head transits on a servo gate.
    Type: Application
    Filed: August 29, 2003
    Publication date: May 13, 2004
    Inventor: Nobuhiro Sugawara
  • Publication number: 20030123198
    Abstract: First and second magneto-resistive effect elements (1) and (2) of a current perpendicular to plane type having magnetic flux sensing films are laminated through a nonmagnetic intermediate gap layer (3) in such a manner that their magnetic flux sensing films are located close to each other. Then, magneto-resistive change characteristics are caused to become opposite to each other so that a differential output between the output of the first and second magneto-resistive effect elements may be generated as a magnetic sensor output or a differential output between the output of the first and second magneto-resistive effect elements may be generated as a differential output in an external circuit configuration. In this manner, a resolution can be improved by a configuration in which a gap length, which decides a resolution, may not be restricted by a thickness of a magneto-resistive effect element. Therefore, restrictions imposed on the resolution in the MR magnetic sensor can be improved.
    Type: Application
    Filed: August 30, 2002
    Publication date: July 3, 2003
    Inventors: Nobuhiro Sugawara, Masatoshi Yoshikawa, Hiroyuki Ohmori