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公开(公告)号：US11289123B2
公开(公告)日：2022-03-29
申请号：US17350882
申请日：2021-06-17
发明人： Richard L. Galbraith , Weldon M. Hanson , Derrick E. Burton , Niranjay Ravindran , Iouri Oboukhov
摘要： An external servo writer configured to write a plurality of embedded servo sectors on a magnetic tape to define a plurality of data tracks is disclosed. A first part of the plurality of embedded servo sectors is written while controlling an actuator to first move a head vertically along a width of the magnetic tape. A second part of the plurality of embedded servo sectors is written while controlling the actuator to second move the head vertically along the width of the magnetic tape.
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公开(公告)号：US20220246173A1
公开(公告)日：2022-08-04
申请号：US17182589
申请日：2021-02-23
发明人： Guoxiao Guo , Charles A. Park , David Scott C. Amiss , Duc H. Banh , Joey M. Poss , Weldon M. Hanson
摘要： A data storage device is disclosed comprising a head actuated over a magnetic media comprising a plurality of tracks. A first pattern of magnetic transitions is written to a first segment of a first track. Preparation is made to write a second pattern of magnetic transitions to a second segment of a second track adjacent the first segment of the first track. When the second pattern matches the first pattern, a write boost is configured to a first setting, and when the second pattern does not match the first pattern, the write boost is configured to a second setting. The second pattern of magnetic transitions is then written to the second segment of the second track using the configured write boost.
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公开(公告)号：US11200912B1
公开(公告)日：2021-12-14
申请号：US17182365
申请日：2021-02-23
发明人： Guoxiao Guo , Charles A. Park , David Scott C. Amiss , Duc H. Banh , Joey M. Poss , Weldon M. Hanson
摘要： A data storage device is disclosed comprising a head actuated over a magnetic media. A write boost is configured to a first setting, and a first pattern of magnetic transitions is written to a first servo field of a servo sector on the magnetic media using the first setting for the write boost. The write boost is configured to a second setting different from the first setting, and the first pattern of magnetic transitions is written to a second servo field of the servo sector on the magnetic media using the second setting for the write boost.
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4.发明授权公开(公告)号：US10373645B2
公开(公告)日：2019-08-06
申请号：US15816165
申请日：2017-11-17
摘要： A data storage device is disclosed wherein a first codeword is generated comprising first redundancy, and a second codeword is generated comprising second redundancy. At least part of the first codeword is written to a first data sector and a second data sector of a first data track on a disk, and at least part of the second codeword is written to a third data sector and a fourth data sector of the first data track different from the first data sector and the second data sector. When an anomaly is detected in the first data sector, first extended redundancy is generated over at least the first data sector and the second data sector of the first data track without generating second extended redundancy over the third data sector and the fourth data sector. Data is recovered from the first data sector based on the first extended redundancy.
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5.发明申请公开(公告)号：US20190156861A1
公开(公告)日：2019-05-23
申请号：US15816165
申请日：2017-11-17
CPC分类号： G11B20/1833 , H03M13/2906
摘要： A data storage device is disclosed wherein a first codeword is generated comprising first redundancy, and a second codeword is generated comprising second redundancy. At least part of the first codeword is written to a first data sector and a second data sector of a first data track on a disk, and at least part of the second codeword is written to a third data sector and a fourth data sector of the first data track different from the first data sector and the second data sector. When an anomaly is detected in the first data sector, first extended redundancy is generated over at least the first data sector and the second data sector of the first data track without generating second extended redundancy over the third data sector and the fourth data sector. Data is recovered from the first data sector based on the first extended redundancy.
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公开(公告)号：US11482247B2
公开(公告)日：2022-10-25
申请号：US17182589
申请日：2021-02-23
发明人： Guoxiao Guo , Charles A. Park , David Scott C. Amiss , Duc H. Banh , Joey M. Poss , Weldon M. Hanson
摘要： A data storage device is disclosed comprising a head actuated over a magnetic media comprising a plurality of tracks. A first pattern of magnetic transitions is written to a first segment of a first track. Preparation is made to write a second pattern of magnetic transitions to a second segment of a second track adjacent the first segment of the first track. When the second pattern matches the first pattern, a write boost is configured to a first setting, and when the second pattern does not match the first pattern, the write boost is configured to a second setting. The second pattern of magnetic transitions is then written to the second segment of the second track using the configured write boost.
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7.发明授权公开(公告)号：US10783913B1
公开(公告)日：2020-09-22
申请号：US16396883
申请日：2019-04-29
摘要： A data storage device is disclosed comprising a head actuated over a disk surface, wherein the head comprises a plurality of elements including a write assist element. A bias signal applied to the write assist element is controlled such that the write assist element is substantially unprotruded, and while the write element is substantially unprotruded, an air bearing resonant frequency (ABRF) of the head and disk surface is measured. The bias signal applied to the write assist element is controlled such that the write assist element protrudes toward the disk surface, and while the write assist element protrudes toward the disk surface, the head is excited at the measured ABRF and the head touching down onto the disk surface is detected.
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公开(公告)号：US10606699B2
公开(公告)日：2020-03-31
申请号：US16244426
申请日：2019-01-10
摘要： A data storage device is disclosed wherein a first plurality of codewords are generated each comprising a plurality of symbols, and a first parity sector is generated over the first plurality of codewords. A second plurality of codewords are generated each comprising a plurality of symbols, and a second parity sector is generated over the second plurality of codewords. A third parity sector is generated over a first subset of the first plurality of codewords and a first subset of the second plurality of codewords, and a fourth parity sector is generated over a second subset of the first plurality of codewords and a second subset of the second plurality of codewords. When processing of a first codeword fails, the first codeword and the first parity sector are processed using a LDPC type decoder, and the first codeword and the third parity sector are processed using the LDPC type decoder.
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公开(公告)号：US10417089B2
公开(公告)日：2019-09-17
申请号：US15895921
申请日：2018-02-13
摘要： A data storage device is disclosed comprising a non-volatile storage medium (NVSM). A reliability metric for each symbol of each of a plurality of codewords read from the NVSM is generated, and a number of erasures for a first codeword are generated, wherein the number of erasures exceeds the correction power of the first codeword. A reliability metric of the first codeword is modified corresponding to one of the erasures. The reliability metrics for each codeword including the modified reliability metrics of the first codeword are first iteratively processed using a low density parity check (LDPC) type decoder, thereby first updating the reliability metric for each symbol of each codeword. The reliability metrics for the first codeword are second updated using the parity sector, and the second updated reliability metrics for the first codeword are second iteratively processed using the LDPC-type decoder.
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公开(公告)号：US11373682B2
公开(公告)日：2022-06-28
申请号：US17177715
申请日：2021-02-17
IPC分类号： G11B20/12 , G11B27/029 , G11B27/30
摘要： A data storage device is disclosed comprising at least one head configured to access a magnetic tape. The head is used to write contiguously to the magnetic tape a first preamble, followed by a first sync mark, followed by symbols of a first data sector, followed by a second sync mark, followed by a second preamble, followed by a third sync mark, followed by symbols of a second data sector.
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