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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：US11055171B2
公开(公告)日：2021-07-06
申请号：US16815416
申请日：2020-03-11
摘要： A data storage device is disclosed comprising a head actuated over a disk. A first plurality of codewords and corresponding parity sector are generated, and a second plurality of codewords and corresponding parity sector are generated. The first and second plurality of codewords are written to the disk, and during a read of the first and second set of codewords, M codeword locations within the data track that are unrecoverable are saved, and N codeword locations out of the M codeword locations are selected based on a quality metric of the read. The N codewords are reread from the data track at the N codeword locations and reliability metrics associated with the N codewords are saved. The saved reliability metrics are updated using at least one of the first parity sector or the second parity sector.
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公开(公告)号：US11513895B1
公开(公告)日：2022-11-29
申请号：US17345434
申请日：2021-06-11
摘要： A data storage device is disclosed comprising a non-volatile storage medium (NVSM). Problematic patterns in a block of input data are identified, and the problematic patterns are relocated from an initial location to an erasure region of the block to generate a modified block. The modified block is erasure encoded into an erasure codeword, at least part of the erasure codeword is stored in the NVSM.
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公开(公告)号：US11295764B1
公开(公告)日：2022-04-05
申请号：US17214870
申请日：2021-03-28
摘要： A data storage device is disclosed comprising a head actuated over a magnetic media, wherein the head comprises a write element and a first read element. A preamp circuit comprising an interface includes at least a write line associated with the write element of the head and a first read line associated with the first read element of the head. A first read signal is received from the preamp circuit over the first read line during a read operation, and configuration data is transmitted to the preamp circuit over the first read line during a write operation.
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公开(公告)号：US10592334B2
公开(公告)日：2020-03-17
申请号：US15983016
申请日：2018-05-17
摘要： A data storage device is disclosed comprising a non-volatile storage medium (NVSM), wherein a plurality of codewords and corresponding parity sector are written to the NVSM and then read from the NVSM. Each codeword read from the NVSM is processed using a Viterbi-type detector, thereby generating codeword reliability metrics. The codeword reliability metrics for at least some of the codewords are processed using a low density parity check (LDPC) type decoder, thereby generating a LDPC reliability metric for each symbol of at least one codeword. The LDPC reliability metrics for at least one of an un-converged codeword are processed using the parity sector, thereby updating the un-converged codeword reliability metrics. Processing the codeword reliability metrics with the LDPC decoder and updating the reliability metrics with the parity sector is repeated at least once before updating the LDPC reliability metrics of at least the un-converged codeword using the Viterbi-type detector.
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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：US11411584B2
公开(公告)日：2022-08-09
申请号：US17179542
申请日：2021-02-19
摘要： A data storage device is disclosed comprising a non-volatile storage medium (NVSM). A first block of data is channel encoded into first channel data based on a channel code constraint, and the first channel data is error correction encoded to generate first redundancy bits. A second block of data is channel encoded into second channel data based on the channel code constraint and the first redundancy bits, and the first channel data and the second channel data are error correction encode to generate second redundancy bits. A third block of data is channel encoded into third channel data based on the channel code constraint and the second redundancy bits. The first, second and third channel data and the first and second redundancy bits are stored in the NVSM.
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8.发明授权公开(公告)号：US11386927B1
公开(公告)日：2022-07-12
申请号：US17330675
申请日：2021-05-26
摘要： A data storage device configured to access a magnetic tape is disclosed comprising a plurality of data tracks. A first head is configured to access a first data track comprising a first sync mark, and a second head is configured to access a second data track comprising a second sync mark. The first head is used to read first data from the first data track, wherein the first data comprises a plurality of symbols, and the second head is used to read the second sync mark from the second data track. The first data is symbol synchronized based on the second head reading the second sync mark from the second data track.
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公开(公告)号：US11138996B1
公开(公告)日：2021-10-05
申请号：US16870612
申请日：2020-05-08
发明人： Richard L. Galbraith , Weldon M. Hanson , Derrick E. Burton , Niranjay Ravindran , Iouri Oboukhov
摘要： A data storage device is disclosed comprising at least one head configured to access a magnetic tape comprising a plurality of data tracks, wherein each data track comprises a plurality of data segments and a plurality of servo sectors. The head is used to read one of the servo sectors to generate a first read signal. The first read signal is processed to generate a position error signal (PES) of the head relative to the magnetic tape, wherein the head is positioned relative to the magnetic tape based on the PES. The head is used to read one of the data segments to generate a second read signal, wherein the second read signal is processed to detect user data recorded in the data segment.
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公开(公告)号：US11049520B1
公开(公告)日：2021-06-29
申请号：US16870658
申请日：2020-05-08
发明人： Richard L. Galbraith , Weldon M. Hanson , Derrick E. Burton , Niranjay Ravindran , Iouri Oboukhov
摘要： A data storage device is disclosed comprising at least one head configured to access a magnetic tape. Data is read from the magnetic tape to generate a read signal which is processed to decode a first M blocks of low density parity check (LDPC) type codewords using a LDPC type decoder. First un-converged codewords out of the first M blocks are decoded using a first M-blocks parity, and second un-converged codewords out of the first M blocks are decoded using an erasure code.
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