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公开(公告)号：US10528348B2
公开(公告)日：2020-01-07
申请号：US15914598
申请日：2018-03-07
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , WenXiang Xie , Quan Li , Jian Qiang
IPC: G06F12/02 , G06F12/08 , G06F9/30 , G06F12/0893 , G06F12/0866 , G11B20/10 , G11B20/12
Abstract: In one implementation, this disclosure provides a method for executing a partial band rewrite operation comprising identifying a first track of a shingled data band to receive data of a write received at a shingled media storage device and writing a first subset of the received data to a media cache, where the first subset corresponds to the first track of the shingled data band to receive data of the write command. The method also includes writing a remaining subset of the received data to target locations within the shingled data band without updating data on the first track within the shingled data band corresponding to the first subset of the received data.
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12.发明申请公开(公告)号：US20190341075A1
公开(公告)日：2019-11-07
申请号：US16221839
申请日：2018-12-17
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Quan Li , Ralph William Cross
Abstract: A sequence of symbols is generated to describe a set of write data, the symbols having a length of nT, where T is a channel clock rate and n is an integer over a predetermined range. Bi-directional write currents are applied to a write pole to record the sequence of symbols to a magnetic storage medium. The write pole has an effective footprint with a downtrack length of mT, where m is an integer. The write currents are switched between a first rail current and a second rail current for alternating symbols, the write currents further transitioning to an intermediate current value for at least one channel clock period for symbols longer than 1T. Write currents are applied to the write pole when recording symbols having a length longer than mT using the effective footprint of the write pole as an interval.
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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：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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15.发明授权公开(公告)号：US11450341B1
公开(公告)日：2022-09-20
申请号：US17407652
申请日：2021-08-20
Applicant: Seagate Technology LLC
Abstract: An apparatus comprises a write pole for writing data to a magnetic recording medium and a near-field transducer (NFT) optically coupled to a laser source and configured to produce a thermal spot on the medium. A laser driver applies laser operation power (Iop) to the laser source. A channel circuit generates symbols having a length of nT, where T is a channel clock rate and n is an integer. The laser driver applies Iop to the laser source and a write driver applies bi-directional write currents to the write pole to record the symbols at a location of the thermal spot on the medium, wherein a duration of applying Iop to the laser source by the laser driver is dependent on a length of the symbols and the effective thermal spot size.
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Patent Agency Ranking
16.发明授权公开(公告)号：US11127419B1
公开(公告)日：2021-09-21
申请号：US17141491
申请日：2021-01-05
Applicant: Seagate Technology LLC
IPC: G11B5/00 , G11B7/0045 , G11B5/09 , G11B5/39 , G11B20/10
Abstract: An apparatus comprises a write pole for writing data to a magnetic recording medium and a near-field transducer (NFT) optically coupled to a laser source and configured to produce a thermal spot on the medium. A laser driver applies laser operation power (Iop) to the laser source. A channel circuit generates symbols having a length of nT, where T is a channel clock rate and n is an integer. The laser driver applies Iop to the laser source and a write driver applies bi-directional write currents to the write pole to record the symbols at a location of the thermal spot on the medium, wherein a duration of applying Iop to the laser source by the laser driver is dependent on a length of the symbols and the effective thermal spot size.
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公开(公告)号：US10698658B2
公开(公告)日：2020-06-30
申请号：US15894116
申请日：2018-02-12
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Lihong Zhang , WenXiang Xie , Quan Li
IPC: G06F7/58
Abstract: Apparatuses and methods disclosed herein relate to detecting a signal generated by a spin torque oscillator (STO). The signal is outputted, wherein the signal includes a direct current (DC) component, a wide bandwidth noise component, and an STO oscillating radio frequency (RF) component. The signal is filtered, wherein the filtering removes the DC component and the STO oscillating RF component, leaving the wide bandwidth noise component. A value of the wide bandwidth noise component is converted into a binary value, and a bit from the binary value is selected and combined with another bit to form a random number.
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公开(公告)号：US10388314B1
公开(公告)日：2019-08-20
申请号：US15951518
申请日：2018-04-12
Applicant: Seagate Technology LLC
Inventor： Xiong Liu , Lan Xia , Quan Li , Lihong Zhang , Swee Chuan Samuel Gan
Abstract: Apparatus and method for reducing the effects of thermal asperities on a rotatable data recording surface. A data transducer writes user data to a first set of tracks at a first fly height above the recording surface. A compensation circuit detects a thermal asperity (TA) on the recording surface, and establishes a guard band as a second set of tracks that are co-radial with the TA. The second set of tracks are deallocated and removed from service. The compensation circuit further defines a reserve band as a third set of tracks immediately adjacent the guard band, and selects an increased, second fly height that allows the data transducer to write data to the reserve band without contacting the TA. The second set of tracks may have a greater track pitch than the first set of tracks to compensate for the greater fly height.
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公开(公告)号：US10341115B2
公开(公告)日：2019-07-02
申请号：US15248738
申请日：2016-08-26
Applicant: Seagate Technology LLC
Inventor： William Erik Anderson , Jiangnan Lin , Xiong Liu , Quan Li
Abstract: Apparatus and method for data security in a data storage device. In some embodiments, an alternating pattern is written to a magnetic recording medium as a sequence of symbols at a selected clock rate. A repeatable magnetic signature is generated by reading the alternating pattern from the medium, the magnetic signature having relatively weak entropy at boundaries of the symbols. A multi-bit digital sequence is extracted from the repeatable magnetic signature, the digital sequence having relatively strong entropy. The digital sequence is stored in a separate memory coupled to the medium. Access to data stored on the medium is authenticated responsive to the digital sequence stored in the separate memory.
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公开(公告)号：US20180182432A1
公开(公告)日：2018-06-28
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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