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公开(公告)号：US12230302B2
公开(公告)日：2025-02-18
申请号：US18180463
申请日：2023-03-08
Inventor： Yusuke Tomoda
Abstract: According to an embodiment, a magnetic disk device includes a magnetic disk, a magnetic head, and a control circuit. The magnetic disk has a plurality of first storage regions disposed in the radial direction. The recording method is changeable for each of the plurality of first storage regions. The control circuit operates such that, when having received a first command instructing to change the recording method of one first storage region out of a plurality of first storage regions, the control circuit changes the recording method of the one first storage region in accordance with the first command, and moves a magnetic head onto the second storage region before receiving a second command.
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公开(公告)号：US12211519B2
公开(公告)日：2025-01-28
申请号：US18243549
申请日：2023-09-07
Inventor： Kana Furuhashi , Yosuke Kondo
IPC: G11B20/18
Abstract: According to one embodiment, a magnetic disk device includes a read control system that extracts scrambled data from media data read from a medium and inspection data associated with a seed value at the time of write, generates inspection data for data extracted from the media data, obtains from the inspection data and inspection data extracted from the media data, a seed value associated with both, compares this seed value with the seed value expected by the controller, and evaluates, when the comparison result is a mismatch, the data as an error, whereas when match, descrambles the data extracted from the media data using the seed value.
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公开(公告)号：US12165674B1
公开(公告)日：2024-12-10
申请号：US18594089
申请日：2024-03-04
Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
Inventor： Simeon Furrer , Mark Alfred Lantz , Martin Petermann , Ilias Iliadis
Abstract: Provided are a computer program product, device, system, and method for write data management. In one embodiment, a write management controller calculates an order for writing data and parity blocks of write data code words on tape media in a variable interleaved fashion which ensures a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word. The calculated write order information may be provided back to a host or other data source so that the write data is eventually transmitted to the tape drive for writing on tape media in accordance with the calculated write order. In this manner, a minimum physical longitudinal separation along the length of tape between data and parity blocks of the same code word may be achieved to increase the reliability of the data storage.
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公开(公告)号：US20240296869A1
公开(公告)日：2024-09-05
申请号：US18537486
申请日：2023-12-12
Inventor： Yosuke KONDO , Syosuke MARUYAMA
CPC classification number: G11B20/00637 , G11B5/09 , G11B19/045 , G11B20/00666 , G11B20/00949 , G11B20/1252 , G11B20/1879 , G11B2020/1232 , G11B2020/1843 , G11B2020/185 , G11B2220/2516
Abstract: According to the embodiment, an HDC receives a plurality of data segments from a host, and executes generation and addition of a first code and output of a data segment to which the first code is added to each data segment. An HDC calculates exclusive OR with respect to the first codes, and outputs obtained first information. The RWC performs data conversion and calculation of exclusive OR on the plurality of data segments to which the first code is added, and outputs the plurality of data segments after the data conversion and a track parity obtained by the calculation of the exclusive OR. The RWC acquires the first code from the plurality of data segments. The RWC calculates exclusive OR with respect to a group of the second codes which are the acquired first codes to acquire second information. The RWC compares the first information with the second information.
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公开(公告)号：US12051451B2
公开(公告)日：2024-07-30
申请号：US18178128
申请日：2023-03-03
Inventor： Yu Yamamoto , Takao Abe
CPC classification number: G11B5/59688
Abstract: According to embodiments, a magnetic disk device includes a magnetic disk, a magnetic head, and a controller. In the magnetic disk, a plurality of servo sectors is arranged in a circumferential direction. Servo information including a post code indicating a repeatable runout (RRO) correction amount is written to each of the plurality of servo sectors. The magnetic head writes and reads data to and from the magnetic disk. In positioning control for the magnetic head, when a read error of a first post code continuously occurs, the controller uses a first RRO correction value, which is different from a second RRO correction value based on the RRO correction value indicated by the first post code. The first post code is a post code of a first servo sector, which is one of the plurality of servo sectors.
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Patent Agency Ranking
6.发明授权公开(公告)号：US11972777B2
公开(公告)日：2024-04-30
申请号：US18174520
申请日：2023-02-24
Applicant: Oracle International Corporation
Inventor： David Dice , Alex Kogan
CPC classification number: G11B20/10268 , G06F9/526 , G06F16/2343 , G06F16/2365 , G11B20/105 , G11C16/26
Abstract: A data object has a lock and a condition indicator associated with it. Based at least partly on detecting a first setting of the condition indicator, a reader stores an indication that the reader has obtained read access to the data object in an element of a readers structure and reads the data object without acquiring the lock. A writer detects the first setting and replaces it with a second setting, indicating that the lock is to be acquired by readers before reading the data object. Prior to performing a write on the data object, the writer verifies that one or more elements of the readers structure have been cleared.
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公开(公告)号：US11942119B2
公开(公告)日：2024-03-26
申请号：US17590739
申请日：2022-02-01
Inventor： Akiyo Mizutani , Koji Sonoda , Makoto Okamoto , Takuma Kido
CPC classification number: G11B33/1466 , G11B20/1816 , G11B33/146
Abstract: According to one embodiment, a magnetic recording/reproducing apparatus includes irreversible adsorbing materials in a sealed housing for the magnetic recording/reproducing apparatus.
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公开(公告)号：US11929094B1
公开(公告)日：2024-03-12
申请号：US18115396
申请日：2023-02-28
Inventor： Syosuke Maruyama , Hideo Shimokawa
CPC classification number: G11B20/1879 , G11B5/596 , G11B20/1816 , G11B2020/183
Abstract: According to an embodiment, a track includes first sectors and a second sector. When write of a second data segment to a third sector that is one of the first sectors is requested from a host, a controller acquires the second data segment from the host and stores the second data segment in the memory, and reads a data set including all first data segments and all first information pieces from the track and stores the data set in the memory. The controller acquires a second information piece of the third sector, and updates a first data segment and a first information piece read from the third sector in the data set in the memory with the second data segment and the second information piece. The controller calculates a second parity while the updated data set to the track, and writes the second parity to the second sector.
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公开(公告)号：US11881238B1
公开(公告)日：2024-01-23
申请号：US17880251
申请日：2022-08-03
Applicant: Western Digital Technologies, Inc.
Inventor： Zarko Popov , Wayne H. Vinson , Xing Huo , Mao Nishiyama
CPC classification number: G11B5/59655 , G11B5/012
Abstract: Various illustrative aspects are directed to a data storage device comprising one or more disks, an actuator assembly comprising one or more disk heads; and one or more processing devices, configured to detect a plurality of areas with a coercivity lower than a threshold on the one or more disks; map out one or more sectors in each of the plurality of lower coercivity areas on the one or more disks; write data to, or read data from, the one or more disks, based at least in part on mapping out the one or more sectors in each of the plurality of lower coercivity areas. In some embodiments, the writing or reading data comprises writing data to, or reading data from, one or more sectors of the one or more disks that are not mapped out.
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公开(公告)号：US11862204B2
公开(公告)日：2024-01-02
申请号：US17897062
申请日：2022-08-26
Inventor： Kana Furuhashi
CPC classification number: G11B5/012 , G11B21/106
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.
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