Patents by Inventor Seiji Toda

Seiji Toda 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: 10570016
    Abstract: The present invention relates to carbon nanotubes that are excellent in dispersibility and a process for producing the carbon nanotubes. The carbon nanotubes according to the present invention each comprise a wall that comprises a parallel portion and a narrowed portion having a tube outer diameter that is not more than 90% of a tube outer diameter of the parallel portion. Thus, the carbon nanotubes are readily dispersible owing to a high abundance ratio of easily-breaking portions.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: February 25, 2020
    Assignee: TODA KOGYO CORP.
    Inventors: Wataru Oda, Kazushige Kawai, Tomohiro Honda, Seiji Okazaki, Norimichi Nagai, Tetsuro Toda
  • Publication number: 20180275876
    Abstract: According to one embodiment, there is provided a disk device including a disk medium, a command queue, and a controller. The disk medium stores data in accordance with addresses. Into the command queue, commands are enqueued in order. The controller regroups a plurality of groups grouped correspondingly to the addresses in the disk medium in response to a command enqueued into the command queue or a command dequeued from the command queue, and performs a process for the command queue based on the regrouped plurality of groups.
    Type: Application
    Filed: September 5, 2017
    Publication date: September 27, 2018
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Kenshu NAKASHIMA, Seiji Toda, Michihiko Umeda, Yasuyuki Nagashima
  • 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: 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: 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: 20160299686
    Abstract: According to one embodiment, there is provided a disk device including a disk to store data and a controller to control writing data to the disk and reading data from the disk. The controller queues a command from a host device, executes a first command included in the queued command, and executes reordering processing to a plurality of commands which accesses a vicinity of a physical position of an access destination of the first command.
    Type: Application
    Filed: July 20, 2015
    Publication date: October 13, 2016
    Inventors: Yasuyuki Nagashima, Michihiko Umeda, Seiji Toda, Minoru Yamamoto
  • 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: 20160170891
    Abstract: According to one embodiment, there is provided a disk apparatus including a disk medium, a nonvolatile memory, and a controller. In the nonvolatile memory, data to be recorded to the disk medium is written. The controller is configured to perform, according to amount of free space of the nonvolatile memory, write process of the data in the nonvolatile memory collectively, or in multiple times with dividing the write process.
    Type: Application
    Filed: March 4, 2015
    Publication date: June 16, 2016
    Inventors: Michio Yamamoto, Isao Fujita, Takumi Kakuya, Masami Tashiro, Yuka Kuwano, Takato Kuji, Katsushi Ohta, Seiji Toda
  • 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: 20150026427
    Abstract: A data reassign method in an embodiment includes: when a reassign command specifying a first logical sector that is included in a first physical sector and that has not been specified yet by the reassign command is received, reassigning data in the first physical sector to a second physical sector different from the first physical sector; and refraining thereafter from reassigning data in the second physical sector until occurrence of either re-receipt of the reassign command for the first logical sector or second-time or later receipt of a reassign command for a second logical sector other than the first logical sector included in the second physical sector.
    Type: Application
    Filed: September 13, 2013
    Publication date: January 22, 2015
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Seiji Toda, Kiyotaka Sasaki
  • 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
  • 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: 20120246715
    Abstract: One embodiment provides a recording device, including: a data storage module; an authentication information storage module configured to store authentication information; a receiving module configured to receive authentication information from a higher level apparatus; an authenticating module configured to perform authentication of access to the data storage module by comparing the received authentication information with the stored authentication information; a command tendency storage module configured to store a command tendency; a command tendency determinator configured to determine whether or not a command tendency relating to commands being transmitted from the higher level apparatus is similar to the previously-stored command tendency; and a use disabling module configured to render the data stored in the data storage module substantially unusable based on a determination of the command tendency determinator.
    Type: Application
    Filed: December 22, 2011
    Publication date: September 27, 2012
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Seiji Toda
  • Patent number: 8276017
    Abstract: In a system management apparatus, a failure detection unit detects a readout failure in one of blocks constituting distributed data stored in a first RAID disk array. A request unit requests a computer to supplement one of the blocks of the distributed data stored in the first RAID disk array in which a readout failure irrecoverable by use of only the data stored in the first RAID disk array occurs, where the computer has a second RAID disk array storing a duplicate of the distributed data stored in the first RAID disk array. And an overwriting unit receives data corresponding to the one of the blocks from the computer, and overwrites the one of the blocks with the received data.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: September 25, 2012
    Assignee: Fujitsu Limited
    Inventors: Masahisa Tamura, Yasuo Noguchi, Kazutaka Ogihara, Yoshihiro Tsuchiya, Tetsutaro Maruyama, Riichiro Take, Seiji Toda
  • Patent number: 8230186
    Abstract: A hybrid recording device having a non-volatile semiconductor memory and a recording magnetic disk includes a mapping unit that maps a first recording area in the recording magnetic disk and a second recording area in the non-volatile semiconductor memory, and a controller that controls an access to the second recording area mapped by the mapping unit when there is an access instruction to the first recording area.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: July 24, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Seiji Toda
  • Patent number: 8028142
    Abstract: A controller of a storage device having a user area storing an operating system, the storage device developing the operating system stored in the user area on a host device in accordance with an access from the host device. The controller includes a user authentication routine storage controlling unit that stores a user authentication routine for executing user authentication before startup of the operating system, in a predetermined area inside the user area, and an access controlling unit that permits access to the predetermined area from the host device when the user authentication routine is used, while prohibiting access to the predetermined area from the host device when the user authentication routine is not used.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: September 27, 2011
    Assignee: Toshiba Storage Device Corporation
    Inventors: Seiji Toda, Teruji Yamakawa