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).
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Patent number: 11875824Abstract: 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: GrantFiled: September 6, 2022Date of Patent: January 16, 2024Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Yosuke Kondo, Kana Furuhashi, Kazuya Takada, Eric R. Dunn
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Patent number: 11861183Abstract: 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: GrantFiled: February 24, 2022Date of Patent: January 2, 2024Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Kazumasa Nomura, Kana Furuhashi
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Patent number: 11862204Abstract: 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: GrantFiled: August 26, 2022Date of Patent: January 2, 2024Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventor: Kana Furuhashi
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Publication number: 20230306987Abstract: 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: ApplicationFiled: August 26, 2022Publication date: September 28, 2023Inventor: Kana FURUHASHI
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Publication number: 20230306988Abstract: 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: ApplicationFiled: September 6, 2022Publication date: September 28, 2023Inventors: Yosuke Kondo, Kana Furuhashi, Kazuya Takada, Eric R. Dunn
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Publication number: 20230097610Abstract: 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: ApplicationFiled: February 24, 2022Publication date: March 30, 2023Inventors: Kazumasa NOMURA, Kana FURUHASHI
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Publication number: 20220300622Abstract: 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: ApplicationFiled: September 9, 2021Publication date: September 22, 2022Inventors: Hironori NAKANISHI, Kana FURUHASHI
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Publication number: 20220301590Abstract: 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: ApplicationFiled: August 31, 2021Publication date: September 22, 2022Inventors: Kana FURUHASHI, Hiroyuki TAKEDA
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Publication number: 20220084554Abstract: 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: ApplicationFiled: September 8, 2021Publication date: March 17, 2022Inventors: Syosuke MARUYAMA, Kana FURUHASHI
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Patent number: 10649693Abstract: 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: GrantFiled: March 2, 2018Date of Patent: May 12, 2020Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Yosuke Kondo, Kana Furuhashi
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Patent number: 10504550Abstract: 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: GrantFiled: September 2, 2018Date of Patent: December 10, 2019Assignees: Kabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage CorporationInventors: Syosuke Maruyama, Kana Furuhashi, Yosuke Kondo
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Patent number: 10438615Abstract: 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: GrantFiled: March 14, 2019Date of Patent: October 8, 2019Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Syosuke Maruyama, Kana Furuhashi
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Publication number: 20190279678Abstract: 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: ApplicationFiled: September 2, 2018Publication date: September 12, 2019Inventors: Syosuke MARUYAMA, Kana FURUHASHI, Yosuke KONDO
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Publication number: 20190214040Abstract: 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: ApplicationFiled: March 14, 2019Publication date: July 11, 2019Inventors: Syosuke MARUYAMA, Kana FURUHASHI
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Patent number: 10249327Abstract: 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: GrantFiled: March 2, 2018Date of Patent: April 2, 2019Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Syosuke Maruyama, Kana Furuhashi
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Publication number: 20190073158Abstract: 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: ApplicationFiled: March 2, 2018Publication date: March 7, 2019Inventors: Yosuke KONDO, Kana FURUHASHI
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Publication number: 20180308512Abstract: 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: ApplicationFiled: March 2, 2018Publication date: October 25, 2018Inventors: Syosuke MARUYAMA, Kana FURUHASHI
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Publication number: 20170039397Abstract: 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: ApplicationFiled: November 11, 2015Publication date: February 9, 2017Inventors: Kana Furuhashi, Hironori Nakanishi
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Publication number: 20150339183Abstract: According to embodiments, a controller is provided with a receiving unit which receives data and a first redundant bit generated by coding the data by using a first generator polynomial, a coding unit which codes the data by using a second generator polynomial having a common factor with the first generator polynomial to generate a second redundant bit, and an error check unit which determines whether there is difference between the input data to coding by using the first generator polynomial and the input data to coding by using the second generator polynomial by dividing an XOR operation result of the first redundant bit and a result of a bit shift of the second redundant bit by the common factor.Type: ApplicationFiled: September 4, 2014Publication date: November 26, 2015Inventors: Hironori Nakanishi, Kana Furuhashi
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Publication number: 20150249467Abstract: According to one embodiment, a storage device includes a buffer configured to store encrypted data; an error detection code generator configured to generate an error detection code of the encrypted data; a key information generator configured to generate key information of an encryption key; a protection code generator configured to generate a protection code, which is an error detection code of the key information; a key information attaching unit configured to attach the key information and the protection code to the error detection code, and add the same to the encrypted data as redundant data; and a media configured to store the encrypted data.Type: ApplicationFiled: May 20, 2014Publication date: September 3, 2015Applicant: Kabushiki Kaisha ToshibaInventors: Hironori NAKANISHI, Kana FURUHASHI