Patents by Inventor Kana FURUHASHI

Kana FURUHASHI 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: 12033662
    Abstract: A magnetic disk device includes a disk including a plurality of error sectors including a defect, a first track having a first parity sector, and a controller. The controller is configured to, upon receiving a write command to write first data in a first region of a portion of the first track, which is a portion of the first track, first perform an XOR operation on all sectors of the first track other than one or more sectors of the first region and the first parity sector of the first track, and then write the first data in the one or more sectors of the first region, perform a second XOR operation on the one or more sectors of the first region and the result of the first XOR operation, and write the result of the second XOR operation in the first parity sector.
    Type: Grant
    Filed: August 31, 2021
    Date of Patent: July 9, 2024
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Kana Furuhashi, Hiroyuki Takeda
  • Patent number: 11989311
    Abstract: According to one embodiment, a magnetic disk device includes a disk, a head writing data to the disk and reading data from the disk, and a controller managing a key generation of a cryptographic key, based on generation confirmation information which is generated by the cryptographic key managed by an external device and transferred from the external device, and which is unable to generate the cryptographic key.
    Type: Grant
    Filed: September 9, 2021
    Date of Patent: May 21, 2024
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Hironori Nakanishi, Kana Furuhashi
  • Patent number: 11875824
    Abstract: According to an embodiment, each of a plurality of controller chips included in a magnetic disk device includes a buffer control circuit and an arbitration circuit, and controls a corresponding one of a plurality of actuator systems. The first controller chip is connected to a buffer memory via the buffer control circuit included in the first controller chip, and is connected to the second controller chip. The second controller chip is connected to the first controller chip and the third controller chip. The arbitration circuit included in the second controller chip performs arbitration between data transfer between the third controller chip and the first controller chip and data transfer between the first controller chip and an actuator system controlled by the second controller chip among the plurality of actuator systems.
    Type: Grant
    Filed: September 6, 2022
    Date of Patent: January 16, 2024
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Yosuke Kondo, Kana Furuhashi, Kazuya Takada, Eric R. Dunn
  • Patent number: 11861183
    Abstract: A disk device includes a volatile memory, a nonvolatile memory, and a controller. The controller is configured to receive, from a host, a key setting request that includes a cryptographic key, a key ID thereof, and tag information of the cryptographic key and generate generation information of the cryptographic key. The controller is also configured to store a first entry including the tag information, the cryptographic key, and the generation information associated with each other in the volatile memory, and store a second entry including the key ID and the generation information associated with each other in the nonvolatile memory.
    Type: Grant
    Filed: February 24, 2022
    Date of Patent: January 2, 2024
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Kazumasa Nomura, Kana Furuhashi
  • Patent number: 11862204
    Abstract: A magnetic disk device includes a magnetic disk including a track having a plurality of sectors, a motor configured to rotate the magnetic disk, a magnetic head, and a controller. The controller is configured to perform a first read operation of reading target sectors among the sectors of the track, with the magnetic head during a first revolution of the magnetic disk, detect an off-track state of the magnetic head during the first revolution of the magnetic disk, perform a first error correction with respect to data read from the target sectors during the first read operation, and perform a second read operation of selectively reading a part of the target sectors for which the off-track state has been detected or the first error correction is unsuccessful, with the magnetic head during a second revolution of the magnetic disk.
    Type: Grant
    Filed: August 26, 2022
    Date of Patent: January 2, 2024
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventor: Kana Furuhashi
  • Publication number: 20230306988
    Abstract: According to an embodiment, each of a plurality of controller chips included in a magnetic disk device includes a buffer control circuit and an arbitration circuit, and controls a corresponding one of a plurality of actuator systems. The first controller chip is connected to a buffer memory via the buffer control circuit included in the first controller chip, and is connected to the second controller chip. The second controller chip is connected to the first controller chip and the third controller chip. The arbitration circuit included in the second controller chip performs arbitration between data transfer between the third controller chip and the first controller chip and data transfer between the first controller chip and an actuator system controlled by the second controller chip among the plurality of actuator systems.
    Type: Application
    Filed: September 6, 2022
    Publication date: September 28, 2023
    Inventors: Yosuke Kondo, Kana Furuhashi, Kazuya Takada, Eric R. Dunn
  • Publication number: 20230306987
    Abstract: A magnetic disk device includes a magnetic disk including a track having a plurality of sectors, a motor configured to rotate the magnetic disk, a magnetic head, and a controller. The controller is configured to perform a first read operation of reading target sectors among the sectors of the track, with the magnetic head during a first revolution of the magnetic disk, detect an off-track state of the magnetic head during the first revolution of the magnetic disk, perform a first error correction with respect to data read from the target sectors during the first read operation, and perform a second read operation of selectively reading a part of the target sectors for which the off-track state has been detected or the first error correction is unsuccessful, with the magnetic head during a second revolution of the magnetic disk.
    Type: Application
    Filed: August 26, 2022
    Publication date: September 28, 2023
    Inventor: Kana FURUHASHI
  • Publication number: 20230097610
    Abstract: A disk device includes a volatile memory, a nonvolatile memory, and a controller. The controller is configured to receive, from a host, a key setting request that includes a cryptographic key, a key ID thereof, and tag information of the cryptographic key and generate generation information of the cryptographic key. The controller is also configured to store a first entry including the tag information, the cryptographic key, and the generation information associated with each other in the volatile memory, and store a second entry including the key ID and the generation information associated with each other in the nonvolatile memory.
    Type: Application
    Filed: February 24, 2022
    Publication date: March 30, 2023
    Inventors: Kazumasa NOMURA, Kana FURUHASHI
  • Publication number: 20220301590
    Abstract: A magnetic disk device includes a disk including a plurality of error sectors including a defect, a first track having a first parity sector, and a controller. The controller is configured to, upon receiving a write command to write first data in a first region of a portion of the first track, which is a portion of the first track, first perform an XOR operation on all sectors of the first track other than one or more sectors of the first region and the first parity sector of the first track, and then write the first data in the one or more sectors of the first region, perform a second XOR operation on the one or more sectors of the first region and the result of the first XOR operation, and write the result of the second XOR operation in the first parity sector.
    Type: Application
    Filed: August 31, 2021
    Publication date: September 22, 2022
    Inventors: Kana FURUHASHI, Hiroyuki TAKEDA
  • Publication number: 20220300622
    Abstract: According to one embodiment, a magnetic disk device includes a disk, a head writing data to the disk and reading data from the disk, and a controller managing a key generation of a cryptographic key, based on generation confirmation information which is generated by the cryptographic key managed by an external device and transferred from the external device, and which is unable to generate the cryptographic key.
    Type: Application
    Filed: September 9, 2021
    Publication date: September 22, 2022
    Inventors: Hironori NAKANISHI, Kana FURUHASHI
  • Publication number: 20220084554
    Abstract: According to one embodiment, a magnetic disk device includes a disk including a first area where user data is written and a second area which is different from the first area, a head configured to write data to the disk and read data from the disk, and a controller configured to generate, when a first sector of a first track, which includes a first parity sector and the first sector which is different from the first parity sector in the first area, is reassigned to a second track in the second area, a second parity sector corresponding to the first sector.
    Type: Application
    Filed: September 8, 2021
    Publication date: March 17, 2022
    Inventors: Syosuke MARUYAMA, Kana FURUHASHI
  • Patent number: 10649693
    Abstract: A hard disk device accepts logical block addresses (LBAs) from a host. The hard disk device includes a disk having a plurality of physical sectors from which data is read and to which data is written, and a processor configured to perform read and write operations on the disk in response to read and write commands from the host that designate LBAs. The processor, in response to a request for initialization, does not perform any write operations on the disk, and generates a new mapping of LBAs to the physical sectors for a current generation based on unusable sectors detected during a previous generation, and tracks differences in correspondence between LBAs and the physical sectors between the current generation and the previous generation.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: May 12, 2020
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Yosuke Kondo, Kana Furuhashi
  • Patent number: 10504550
    Abstract: A magnetic disk device includes a plurality of tracks and a controller. The controller receives write data to be written to a first sector of a track, generates a first data string based on the write data and a logical identifier for the first sector, attempts to cause the first data string to be written to the first sector, determines whether a write error has occurred while the first data string is written to the first sector, generates a second data string based at least in part on the first data string, and in response to determining that no write error has occurred while the first data string is written to the first sector, writes a parity data string that is based at least in part on the second data string to a second sector of the track that stores parity data for the track.
    Type: Grant
    Filed: September 2, 2018
    Date of Patent: December 10, 2019
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
    Inventors: Syosuke Maruyama, Kana Furuhashi, Yosuke Kondo
  • Patent number: 10438615
    Abstract: A disk device includes a recording medium on which data is recorded, a decoding circuit configured to decode data read from the recording medium, and a control circuit. The control circuit is configured to cause first data associated with a target sector referenced in a read request to be read from a target track of the recording medium, second data associated with a non-target sector that is not referenced in the read request to be read from the recording medium after the first data is read from the recording medium, and decoding of the first data to be completed by the decoding circuit after the second data is read from the recording medium.
    Type: Grant
    Filed: March 14, 2019
    Date of Patent: October 8, 2019
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Syosuke Maruyama, Kana Furuhashi
  • Publication number: 20190279678
    Abstract: A magnetic disk device includes a plurality of tracks and a controller. The controller receives write data to be written to a first sector of a track, generates a first data string based on the write data and a logical identifier for the first sector, attempts to cause the first data string to be written to the first sector, determines whether a write error has occurred while the first data string is written to the first sector, generates a second data string based at least in part on the first data string, and in response to determining that no write error has occurred while the first data string is written to the first sector, writes a parity data string that is based at least in part on the second data string to a second sector of the track that stores parity data for the track.
    Type: Application
    Filed: September 2, 2018
    Publication date: September 12, 2019
    Inventors: Syosuke MARUYAMA, Kana FURUHASHI, Yosuke KONDO
  • Publication number: 20190214040
    Abstract: A disk device includes a recording medium on which data is recorded, a decoding circuit configured to decode data read from the recording medium, and a control circuit. The control circuit is configured to cause first data associated with a target sector referenced in a read request to be read from a target track of the recording medium, second data associated with a non-target sector that is not referenced in the read request to be read from the recording medium after the first data is read from the recording medium, and decoding of the first data to be completed by the decoding circuit after the second data is read from the recording medium.
    Type: Application
    Filed: March 14, 2019
    Publication date: July 11, 2019
    Inventors: Syosuke MARUYAMA, Kana FURUHASHI
  • Patent number: 10249327
    Abstract: A disk device includes a recording medium on which data is recorded, a decoding circuit configured to decode data read from the recording medium, and a control circuit. The control circuit is configured to cause first data associated with a target sector referenced in a read request to be read from a target track of the recording medium, second data associated with a non-target sector that is not referenced in the read request to be read from the recording medium after the first data is read from the recording medium, and decoding of the first data to be completed by the decoding circuit after the second data is read from the recording medium.
    Type: Grant
    Filed: March 2, 2018
    Date of Patent: April 2, 2019
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION
    Inventors: Syosuke Maruyama, Kana Furuhashi
  • Publication number: 20190073158
    Abstract: A hard disk device accepts logical block addresses (LBAs) from a host. The hard disk device includes a disk having a plurality of physical sectors from which data is read and to which data is written, and a processor configured to perform read and write operations on the disk in response to read and write commands from the host that designate LBAs. The processor, in response to a request for initialization, does not perform any write operations on the disk, and generates a new mapping of LBAs to the physical sectors for a current generation based on unusable sectors detected during a previous generation, and tracks differences in correspondence between LBAs and the physical sectors between the current generation and the previous generation.
    Type: Application
    Filed: March 2, 2018
    Publication date: March 7, 2019
    Inventors: Yosuke KONDO, Kana FURUHASHI
  • Publication number: 20180308512
    Abstract: A disk device includes a recording medium on which data is recorded, a decoding circuit configured to decode data read from the recording medium, and a control circuit. The control circuit is configured to cause first data associated with a target sector referenced in a read request to be read from a target track of the recording medium, second data associated with a non-target sector that is not referenced in the read request to be read from the recording medium after the first data is read from the recording medium, and decoding of the first data to be completed by the decoding circuit after the second data is read from the recording medium.
    Type: Application
    Filed: March 2, 2018
    Publication date: October 25, 2018
    Inventors: Syosuke MARUYAMA, Kana FURUHASHI
  • Publication number: 20170039397
    Abstract: According to one embodiment, a first encryption key stored in a volatile first storage is input to a data input circuit, the first encryption key input in the data input circuit is encrypted with a second encryption key stored in a volatile second storage, and the access to the data input circuit is limited while the first encryption key is encrypted.
    Type: Application
    Filed: November 11, 2015
    Publication date: February 9, 2017
    Inventors: Kana Furuhashi, Hironori Nakanishi