Patents by Inventor Toshiroh Unoki
Toshiroh Unoki 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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Publication number: 20140317347Abstract: A hard disk drive (HDD) provides for the logical removal of defective physical heads. The HDD includes one or more disks organized into a plurality of regions, each region having a plurality of physical block addresses (PBAs). A number of physical heads are used to read and write information to the disks. A controller is configured to translate logical block addresses (LBAs) received from an external system to PBAs used to access the one or more disks, wherein the controller is configured to logically remove a defective physical head from service by dynamically re-assigning LBAs to each of the plurality of regions while preventing LBAs from being assigned to regions associated with the defective physical head.Type: ApplicationFiled: February 20, 2014Publication date: October 23, 2014Applicant: HGST Netherlands B.V.Inventors: Toru AIDA, Ryoji FUKUHISA, Toshiyuki KONISHI, Daiki NAGAKURA, Mariko SAITO, Toshiroh UNOKI, Yuji YOKOE
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Patent number: 8810941Abstract: Selection of disk drive data tracks for the location of reserved area include providing a media disk with data tracks comprising a user data region. A location is assessed on the media disk with a highest frequency of adjacent track interference and far track interference-refresh potential. The location is then configured to be a reserved area where no user data is written. The reserved area has parameters that are read out first before the disk drive enters an operation enabled state for user interface.Type: GrantFiled: July 10, 2012Date of Patent: August 19, 2014Assignee: HGST Netherlands B.V.Inventors: Toshiroh Unoki, Takeshi Shikama
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Publication number: 20140016224Abstract: Selection of disk drive data tracks for the location of reserved area include providing a media disk with data tracks comprising a user data region. A location is assessed on the media disk with a highest frequency of adjacent track interference and far track interference-refresh potential. The location is then configured to be a reserved area where no user data is written. The reserved area has parameters that are read out first before the disk drive enters an operation enabled state for user interface.Type: ApplicationFiled: July 10, 2012Publication date: January 16, 2014Applicant: HGST NETHERLANDS B.V.Inventors: Toshiroh Unoki, Takeshi Shikama
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Patent number: 7941729Abstract: Embodiments in accordance with the present invention help a disk drive to effectively cope with a data address mark detection error. In one embodiment, a data sector is provided with plural data address marks and an read/write (RW) channel reads out the data sector using part of those data address marks. Each divisional section of a split sector has two data address marks and the RW channel uses one of the two data address marks. A data address mark to be used is specified by a register. When an error occurs in detecting a data address mark, its position is stored in a register. Based on the error position, an error recovery processing section stores, in the register, a data address mark to be used in a next retry.Type: GrantFiled: May 24, 2007Date of Patent: May 10, 2011Assignee: Hitachi Global StorageTechnologies, Netherlands B.V.Inventors: Toshiroh Unoki, Minoru Hashimoto, Toru Aida, Naoki Tajima, Hiroshi Kawanobe
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Patent number: 7746586Abstract: Embodiments of the invention control a recovery procedure effectively in accordance with write conditions. In one embodiment, the data to be written into a sector includes not only user data but also recording condition data, which indicates the temperature prevalent during a write. If a data read is not accurately performed, a recovery procedure is executed. If a data read is accomplished by a retry and the temperature prevalent during a write is lower than predetermined, it is concluded that the employed medium is nondefective. Thus, the read data is rewritten into the same sector without being stored in a spare area. This prevents the spare area from being unnecessarily consumed.Type: GrantFiled: July 1, 2008Date of Patent: June 29, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Toru Aida, Minoru Hashimoto, Toshiroh Unoki, Mariko Kado
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Patent number: 7660062Abstract: Embodiments of the invention control a recovery procedure effectively in accordance with write conditions. In one embodiment, the data to be written into a sector includes not only user data but also recording condition data, which indicates the temperature prevalent during a write. If a data read is not accurately performed, a recovery procedure is executed. If a data read is accomplished by a retry and the temperature prevalent during a write is lower than predetermined, it is concluded that the employed medium is nondefective. Thus, the read data is rewritten into the same sector without being stored in a spare area. This prevents the spare area from being unnecessarily consumed.Type: GrantFiled: September 23, 2004Date of Patent: February 9, 2010Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Toru Aida, Minoru Hashimoto, Toshiroh Unoki, Mariko Kado
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Patent number: 7551389Abstract: Embodiments of the present invention relate to retracting a magnetic head of a disk drive device to a retract position in accordance with a fall state, and to suppressing the performance degradation due to erroneous fall determinations as well as occurrence of damage by a head-disk crash. According to one embodiment of the present invention, in a Hard Disk Drive (HDD), a servo controller moves a head slider to a cylinder at the side of a ramp at a predetermined timing that a fall determiner determines that it is falling and an unload controller starts an unload process. This shortens the time between determination by the fall determiner that it is falling to retraction of the head slider to the retract position. Furthermore, it prevents increase of the erroneous determinations by relaxing the fall determination condition for safety. Also, it shortens the time that the head slider returns to the initial position before the seek in case that it is not determined that it is falling.Type: GrantFiled: October 18, 2007Date of Patent: June 23, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Shingo Tsuda, Kenji Kuroki, Toshiroh Unoki, Minoru Hashimoto
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Patent number: 7542223Abstract: Embodiments of the invention provide ways to write data in a load/unload area. In one embodiment, address numbers (ranging from 981 to 1065) whose order of addressing by host equipment is later than that of address numbers (ranging from 1 to 980) as logical block addresses (LBAs) assigned to data sectors in the data area are assigned as LBAs to data sectors whose absolute block addresses (ABAs) range from 1001 to 1100 in the load/unload area. As a result, when the host equipment performs addressing in a magnetic disk drive, the priority order given to the load/unload area becomes low. Accordingly, with the storage capacity being increased, it is possible to prevent the substantial performance from decreasing.Type: GrantFiled: October 10, 2006Date of Patent: June 2, 2009Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Minoru Hashimoto, Kenji Kuroki, Keishi Takahashi, Toshiroh Unoki
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Publication number: 20080259487Abstract: Embodiments of the invention control a recovery procedure effectively in accordance with write conditions. In one embodiment, the data to be written into a sector includes not only user data but also recording condition data, which indicates the temperature prevalent during a write. If a data read is not accurately performed, a recovery procedure is executed. If a data read is accomplished by a retry and the temperature prevalent during a write is lower than predetermined, it is concluded that the employed medium is nondefective. Thus, the read data is rewritten into the same sector without being stored in a spare area. This prevents the spare area from being unnecessarily consumed.Type: ApplicationFiled: July 1, 2008Publication date: October 23, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Toru Aida, Minoru Hashimoto, Toshiroh Unoki, Mariko Kado
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Publication number: 20080137227Abstract: Embodiments of the present invention relate to retracting a magnetic head of a disk drive device to a retract position in accordance with a fall state, and to suppressing the performance degradation due to erroneous fall determinations as well as occurrence of damage by a head-disk crash. According to one embodiment of the present invention, in a Hard Disk Drive (HDD), a servo controller moves a head slider to a cylinder at the side of a ramp at a predetermined timing that a fall determiner determines that it is falling and an unload controller starts an unload process. This shortens the time between determination by the fall determiner that it is falling to retraction of the head slider to the retract position. Furthermore, it prevents increase of the erroneous determinations by relaxing the fall determination condition for safety. Also, it shortens the time that the head slider returns to the initial position before the seek in case that it is not determined that it is falling.Type: ApplicationFiled: October 18, 2007Publication date: June 12, 2008Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Shingo Tsuda, Kenji Kuroki, Toshiroh Unoki, Minoru Hashimoto
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Patent number: 7373477Abstract: When a host apparatus transfers/swaps stored information between user sectors in a storage device for the purpose of defragmentation or the like, the storage device is allowed to perform the data transfer or swap without transmission between the host apparatus and the storage device after the command is received by the storage device; and consistency in stored information identification is maintained between the host apparatus and the storage device even if the operation is interrupted. In one embodiment, information stored in the destination user sector LBA(Y) is copied to the dummy sector LBA(D), its entry is written in the mapping table RDM, information stored in the source user sector LBA(X) is copied to LBA(Y), and then the RDM entry is erased.Type: GrantFiled: March 17, 2005Date of Patent: May 13, 2008Assignee: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Makoto Takase, Minoru Hashimoto, Toshiroh Unoki, Toru Aida, Mariko Kado
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Publication number: 20070273995Abstract: Embodiments in accordance with the present invention help a disk drive to effectively cope with a data address mark detection error. In one embodiment, a data sector is provided with plural data address marks and an read/write (RW) channel reads out the data sector using part of those data address marks. Each divisional section of a split sector has two data address marks and the RW channel uses one of the two data address marks. A data address mark to be used is specified by a register. When an error occurs in detecting a data address mark, its position is stored in a register. Based on the error position, an error recovery processing section stores, in the register, a data address mark to be used in a next retry.Type: ApplicationFiled: May 24, 2007Publication date: November 29, 2007Applicant: Hitachi Global Storage Technologies Netherlands B.V.Inventors: Toshiroh Unoki, Minoru Hashimoto, Toru Aida, Naoki Tajima, Hiroshi Kawanobe
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Publication number: 20070086106Abstract: Embodiments of the invention provide ways to write data in a load/unload area. In one embodiment, address numbers (ranging from 981 to 1065) whose order of addressing by host equipment is later than that of address numbers (ranging from 1 to 980) as logical block addresses (LBAs) assigned to data sectors in the data area are assigned as LBAs to data sectors whose absolute block addresses (ABAs) range from 1001 to 1100 in the load/unload area. As a result, when the host equipment performs addressing in a magnetic disk drive, the priority order given to the load/unload area becomes low. Accordingly, with the storage capacity being increased, it is possible to prevent the substantial performance from decreasing.Type: ApplicationFiled: October 10, 2006Publication date: April 19, 2007Applicant: Hitachi Global Storage Technilogies Netherlands B.V.Inventors: Minoru Hashimoto, Kenji Kuroki, Keishi Takahashi, Toshiroh Unoki Toshiroh
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Publication number: 20050210214Abstract: When a host apparatus transfers/swaps stored information between user sectors in a storage device for the purpose of defragmentation or the like, the storage device is allowed to perform the data transfer or swap without transmission between the host apparatus and the storage device after the command is received by the storage device; and consistency in stored information identification is maintained between the host apparatus and the storage device even if the operation is interrupted. In one embodiment, information stored in the destination user sector LBA(Y) is copied to the dummy sector LBA(D), its entry is written in the mapping table RDM, information stored in the source user sector LBA(X) is copied to LBA(Y), and then the RDM entry is erased.Type: ApplicationFiled: March 17, 2005Publication date: September 22, 2005Applicant: Hitachi Global Storage Technologies Netherlands, B.V.Inventors: Makoto Takase, Minoru Hashimoto, Toshiroh Unoki, Toru Aida, Mariko Kado
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Publication number: 20050073761Abstract: Embodiments of the invention control a recovery procedure effectively in accordance with write conditions. In one embodiment, the data to be written into a sector includes not only user data but also recording condition data, which indicates the temperature prevalent during a write. If a data read is not accurately performed, a recovery procedure is executed. If a data read is accomplished by a retry and the temperature prevalent during a write is lower than predetermined, it is concluded that the employed medium is nondefective. Thus, the read data is rewritten into the same sector without being stored in a spare area. This prevents the spare area from being unnecessarily consumed.Type: ApplicationFiled: September 23, 2004Publication date: April 7, 2005Applicant: Hitachi Global StorageTechnologies Netherlands, B.V.Inventors: Toru Aida, Minoru Hashimoto, Toshiroh Unoki, Mariko Kado