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公开(公告)号：US20220027056A1
公开(公告)日：2022-01-27
申请号：US16935527
申请日：2020-07-22
发明人： Jian Qiang , Jose Mari Toribio , Teck Khoon Lim , Wenxiang Xie , Xiong Liu
摘要： An adjacent track interference (ATI) metric is determined for each of a plurality of regions of a single surface of a magnetic disk. Based on the ATI metrics, each of the regions is assigned a region-specific directed offline scan (DOS) criterion, at least two of the DOS criteria being different from one another. Based on a write count of a track within one of the regions satisfying the associated region-specific DOS criterion, a DOS remediation of the track is performed.
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公开(公告)号：US09817579B2
公开(公告)日：2017-11-14
申请号：US14859118
申请日：2015-09-18
发明人： Xiong Liu , Wenxiang Xie , Sze Chek Tan , Feng Shen
IPC分类号： G11B20/12 , G06F3/06 , G06F12/0868
CPC分类号： G06F3/0608 , G06F3/0656 , G06F3/0658 , G06F3/0676 , G06F3/068 , G06F12/0868 , G06F2212/1044 , G06F2212/217 , G06F2212/281 , G06F2212/313 , G06F2212/46 , G06F2212/70 , G11B20/10527 , G11B20/1217 , G11B20/1252 , G11B2020/10657 , G11B2020/1238 , G11B2020/1278 , G11B2020/1292
摘要： Systems and methods for maximizing shingled magnetic recording (SMR) drive capacity are described. In one embodiment, the SMR drive may include a main store to store user-accessible data, a media cache and media scratchpad to store internal data temporarily for internal operations, and a storage controller to process read and write requests. In some cases, the main store comprises a shingled media partition and an unshingled media partition. The storage controller may designate one or more data tracks from the shingled media partition as temporary data track guard bands. In some embodiments, a track range is selected based at least in part on at least one of an amount of data in the media cache, a size of the new data in the media cache, and an association between the new data in the media cache and data currently stored within the selected track range.
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公开(公告)号：US11922024B2
公开(公告)日：2024-03-05
申请号：US17828727
申请日：2022-05-31
发明人： Xiong Liu , Wenxiang Xie
CPC分类号： G06F3/0617 , G06F3/0659 , G06F3/0689 , G11B5/59627
摘要： The technology disclosed herein pertains to a method for determining expected command completion time (CCT), the method including receiving a plurality of position error signals (PESs) for an HDD over a predetermined time period, determining sigma of the plurality of PESs, retrieving upper off-track limits (UOL) for one or more data sectors of the HDD, calculating average number of retrieved sectors (A) between two consecutive occurrences of the |PES|>UOL for the HDD, and determining required number of revolutions (CCT) to collect data based on the average number of retrieved data sectors (A) and a total number of requested data sectors (N).
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公开(公告)号：US11360671B2
公开(公告)日：2022-06-14
申请号：US16935527
申请日：2020-07-22
发明人： Jian Qiang , Jose Mari Toribio , Teck Khoon Lim , Wenxiang Xie , Xiong Liu
摘要： An adjacent track interference (ATI) metric is determined for each of a plurality of regions of a single surface of a magnetic disk. Based on the ATI metrics, each of the regions is assigned a region-specific directed offline scan (DOS) criterion, at least two of the DOS criteria being different from one another. Based on a write count of a track within one of the regions satisfying the associated region-specific DOS criterion, a DOS remediation of the track is performed.
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公开(公告)号：US20240087598A1
公开(公告)日：2024-03-14
申请号：US18223896
申请日：2023-07-19
发明人： Xiong Liu , Lihong Zhang , Quan Li , Wenxiang Xie
CPC分类号： G11B5/2654 , G11B5/5547
摘要： A method involves determining a threshold error rate that will result on data stored on a magnetic disk surface of a disk drive being unrecoverable. The method also involves determining a seek velocity that will overwrite sufficient portions of the data such the data will exhibit at least the threshold error rate. The disk drive performs at least one traversal of the magnetic disk surface with a head of the disk drive that emits an erase field during the at least one traversal at the seek velocity. The at least one traversal sanitizes the data.
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公开(公告)号：US12131758B2
公开(公告)日：2024-10-29
申请号：US18223896
申请日：2023-07-19
发明人： Xiong Liu , Lihong Zhang , Quan Li , Wenxiang Xie
CPC分类号： G11B5/2654 , G11B5/5547
摘要： A method involves determining a threshold error rate that will result on data stored on a magnetic disk surface of a disk drive being unrecoverable. The method also involves determining a seek velocity that will overwrite sufficient portions of the data such the data will exhibit at least the threshold error rate. The disk drive performs at least one traversal of the magnetic disk surface with a head of the disk drive that emits an erase field during the at least one traversal at the seek velocity. The at least one traversal sanitizes the data.
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公开(公告)号：US10108343B2
公开(公告)日：2018-10-23
申请号：US15730916
申请日：2017-10-12
发明人： Xiong Liu , Wenxiang Xie , Sze Chek Tan , Feng Shen
IPC分类号： G11B20/10 , G06F3/06 , G06F12/0868 , G11B20/12
摘要： Systems and methods for maximizing shingled magnetic recording (SMR) drive capacity are described. In one embodiment, the SMR drive may include a main store to store user-accessible data, a media cache and media scratchpad to store internal data temporarily for internal operations, and a storage controller to process read and write requests. In some cases, the main store comprises a shingled media partition and an unshingled media partition. The storage controller may designate one or more data tracks from the shingled media partition as temporary data track guard bands. In some embodiments, a track range is selected based at least in part on at least one of an amount of data in the media cache, a size of the new data in the media cache, and an association between the new data in the media cache and data currently stored within the selected track range.
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