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21.发明授权公开(公告)号：US10204650B1
公开(公告)日：2019-02-12
申请号：US16102238
申请日：2018-08-13
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Lihong Zhang , KianKeong Ooi , Xiang Lu
Abstract: Gain values used by a variable gain amplifier (VGA) to read servo marks of a heat-assisted recording medium are measured. Sector-specific, repeatable gain values that indicate an expected VGA gain at a desired clearance are determined based on the measured gain values. The sector-specific, repeatable gain values are used as input to a closed-loop clearance controller together with measured values of servo VGA gain while writing data to the recording medium.
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公开(公告)号：US10176849B1
公开(公告)日：2019-01-08
申请号：US15720486
申请日：2017-09-29
Applicant: Seagate Technology LLC
Inventor： Jian Qiang , Xiong Liu , Choon Wei Ng , Sangyun Jung
Abstract: The disclosed technology includes methods and systems that reduce off-track write retry operations in shingled magnetic recording systems. In one implementation, the method includes writing data to an initial track, determining which side of the initial track is a shingled side, calculating a percentage of position error signal (PES) at a shingled side end of the initial track (PES1) when an off-track write operation occurs, determining whether the PES1 meets a first pre-determined threshold, continue writing data to a second track responsive to determining the PES1 is below a first pre-determined threshold, calculating a percentage of PES at a shingled side end of the second track (PES2), determining whether a combined value of PES1 and PES2 is above a second predetermined threshold to determine a probability value of the initial track being erased, and continue writing to a third track if the combined value is below the second predetermined threshold.
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公开(公告)号：US10115436B1
公开(公告)日：2018-10-30
申请号：US15627856
申请日：2017-06-20
Applicant: Seagate Technology LLC
Inventor： Li Hong Zhang , Xiong Liu , Swee Chuan Gan
Abstract: Described are filters useful in a hard disk drive of a comparable electronic device that requires a highly contaminant-free environment for operation, particularly to these devices in combination with the filter, wherein the filter contains graphene.
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公开(公告)号：US10056109B2
公开(公告)日：2018-08-21
申请号：US15388042
申请日：2016-12-22
Applicant: Seagate Technology LLC
CPC classification number: G11B20/1217 , G11B5/596 , G11B5/59633 , G11B5/59638 , G11B5/59644 , G11B5/59688 , G11B20/1816 , G11B2020/1218 , G11B2020/1238
Abstract: A data storage device can employ shingled magnetic recording with data tracks oriented in order to optimize operational parameters, such as bit error rate. A data storage device can consist of a plurality of data tracks overlapping in a band on a data storage medium. First, second, and third data tracks of the band can be respectively separated by a uniform first track pitch during testing the band for an operational parameter. The first track pitch may then be adjusted to provide at least two different adjusted track pitches with each track pitch measured between longitudinal centerlines of adjacent data tracks of the band.
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公开(公告)号：US09947353B1
公开(公告)日：2018-04-17
申请号：US15659828
申请日：2017-07-26
Applicant: Seagate Technology LLC
Inventor： Lihong Zhang , Xiong Liu , Swee Chuan Gan , Guo Qing Zhang
CPC classification number: G11B5/5565 , G11B5/5552 , G11B5/607 , G11B5/6076 , G11B2005/0021
Abstract: An apparatus comprises magnetic recording disk surfaces and magnetic recording heads comprising a leading and a following head. A controller moves the heads so that the leading head, at a passive fly height, follows a first track of a first disk surface containing a passive thermal asperity (PTA), and the following head, at a passive fly height, follows a first track of a second disk surface. The PTAs on tracks of the second disk surface define virtual PTAs on corresponding tracks of the first disk surface. The controller moves the heads away from the respective first tracks and to neighboring tracks to avoid the PTA and virtual PTAs. The controller is configured to move the heads back to the respective first tracks so that a write or read operation can be performed by the leading head.
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Patent Agency Ranking
公开(公告)号：US20180090179A1
公开(公告)日：2018-03-29
申请号：US15276987
申请日：2016-09-27
Applicant: Seagate Technology LLC
Inventor： Hao Sun , Aravind Pitty , Xiong Liu , Ling Ling Zhang
Abstract: A hard disk drive mounting assembly that includes a disk drive assembly having a base structure that includes a screw hole and a damping insert at least partially surrounding the screw hole. The disk drive assembly further includes a threaded insert positioned in the screw hole of the damping insert.
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公开(公告)号：US09905251B2
公开(公告)日：2018-02-27
申请号：US15043801
申请日：2016-02-15
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Michael R. Montemorra , Ralph W. Cross , Todd M. Lammers , Quan Li , Beng Theam Ko , Kirill Rivkin , Mourad Benakli
CPC classification number: G11B5/09 , G11B5/012 , G11B20/10027 , G11B20/1217 , G11B20/1426
Abstract: Method and apparatus for enhancing write current switching efficiencies during data write operations in a data storage device. In some embodiments, write data are described in the form a sequence of symbols of nT length where T is a channel clock rate and n is an integer over a selected range. Bi-directional write currents are applied to a write element to record the sequence of symbols to a storage medium. The write currents are switched between a first rail current and a second rail current for alternating symbols. The write currents are further transitioned to an intermediate current value for at least one channel clock period immediately preceding a next occurrence of a symbol boundary between an adjacent pair of symbols in the sequence.
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公开(公告)号：US09837111B1
公开(公告)日：2017-12-05
申请号：US15341246
申请日：2016-11-02
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Mingzhong Ding , Xiong Liu , Xiang Lu , Qiang Bi , Kian Keong Ooi
IPC: G11B5/596
CPC classification number: G11B5/59627 , G11B5/59694
Abstract: Systems and methods for compensating for magnetoresistive (MR) jog offset direct current (DC) drift in a disc drive are described. In one embodiment, a method may include determining an occurrence of NOS, for example, by monitoring disc slip, to determine when the method should proceed. An MR jog offset DC drift amount is determined for each head of the disc drive. One of several approaches may be employed for determining the MR jog offset DC drift amount. By determining an MR jog offset DC drift amount for each head, a compensation profile is determined for the drive. The determined compensation profile may then be used during operation of the disc drive to compensate for the DC drift. One of several approaches may be employed for compensating based on the compensation profile.
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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
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Xiong Liu , Wenxiang Xie , Sze Chek Tan , Feng Shen
IPC: G11B20/12 , G06F3/06 , G06F12/0868
CPC classification number: 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
Abstract: 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：US20150364156A1
公开(公告)日：2015-12-17
申请号：US14307130
申请日：2014-06-17
Applicant: SEAGATE TECHNOLOGY LLC
Inventor： Xiong Liu , Chris M. Woldemar , Lihong Zhang , ShuangQuan Min
IPC: G11B19/28
CPC classification number: G11B19/28 , G11B5/6011 , G11B5/607 , G11B19/046
Abstract: Provided is an apparatus including a motor configured to rotate a rotating member at a rotational speed based on an applied current; and a controller configured to modify one or more operating parameters in response to determining whether a change in an environment has occurred based on the applied current.
Abstract translation: 提供了一种装置，其包括：马达，被配置为基于所施加的电流以旋转速度旋转旋转构件; 以及控制器，被配置为响应于基于所施加的电流确定是否已经发生环境变化而修改一个或多个操作参数。
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