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公开(公告)号：US20150380040A1
公开(公告)日：2015-12-31
申请号：US14852755
申请日：2015-09-14
Applicant: Seagate Technology LLC
Inventor： Alfredo Chu , Kenneth Arthur Haapala , Paul William Burnett , Siew Kin Chow
IPC: G11B7/1267 , G11B5/09
CPC classification number: G11B13/08 , G11B5/09 , G11B5/314 , G11B5/4866 , G11B5/6088 , G11B7/1263 , G11B7/1267 , G11B2005/0021
Abstract: A system may have a data storage medium that contains at least one data bit that is accessed by a transducing head that has a near-field transducer. A controller can be connected to the transducing head and store a plurality of near-field transducer operating currents in a memory. The controller may identify a change in efficiency of the near-field transducer from the plurality of near-field transducer operating currents.
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公开(公告)号：US09978403B1
公开(公告)日：2018-05-22
申请号：US15435839
申请日：2017-02-17
Applicant: Seagate Technology LLC
Inventor： Wenzhong Zhu , Alfredo Sam Chu , Siew Kin Chow
CPC classification number: G11B5/3123 , G11B5/3103 , G11B5/3106 , G11B5/3133 , G11B5/3967 , G11B5/4826 , G11B5/4866 , G11B5/607 , G11B5/6088 , G11B13/04 , G11B2005/0021
Abstract: Data is written to a recording medium via a read/write head. Subsequent to the writing, the data is read via a read transducer of a read/write head. An instability indicator is derived based on measurements performed while the reading the data. If the instability indicator exceeds a threshold, a current applied to a write coil of the read/write head is changed for subsequent write operations.
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公开(公告)号：US09734862B1
公开(公告)日：2017-08-15
申请号：US15294946
申请日：2016-10-17
Applicant: Seagate Technology LLC
Inventor： Alfredo Sam Chu , Wenzhong Zhu , Siew Kin Chow , Franklin P. Martens
CPC classification number: G11B20/1816 , G11B5/09 , G11B5/5521 , G11B2005/0021
Abstract: A first tone is written at a first frequency to outer tracks that surround an inner track of a magnetic recording medium. A second tone is written at a second frequency different from the first frequency to the inner track. The first and second frequencies are both lower than a frequency of an AC erase signal. A crosstrack profile of the inner track is determined based on reading amplitude of the second frequency via the read/write head.
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Patent Agency Ranking
公开(公告)号：US20150235665A1
公开(公告)日：2015-08-20
申请号：US14185424
申请日：2014-02-20
Applicant: Seagate Technology LLC
Inventor： Alfredo Sam Chu , Kenneth Arthur Haapala , Paul William Burnett , Siew Kin Chow
IPC: G11B7/1263
CPC classification number: G11B13/08 , G11B5/09 , G11B5/314 , G11B5/4866 , G11B5/6088 , G11B7/1263 , G11B7/1267 , G11B2005/0021
Abstract: A system may have a data storage medium that contains at least one data bit that is accessed by a transducing head that has a near-field transducer. A controller can be connected to the transducing head and store a plurality of near-field transducer operating currents in a memory. The controller may identify a change in efficiency of the near-field transducer from the plurality of near-field transducer operating currents.
Abstract translation: 系统可以具有包含由具有近场换能器的换能头访问的至少一个数据位的数据存储介质。 控制器可以连接到转换头并将多个近场换能器工作电流存储在存储器中。 控制器可以从多个近场换能器工作电流中识别近场换能器的效率变化。
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5.发明授权公开(公告)号：US09892752B1
公开(公告)日：2018-02-13
申请号：US15623777
申请日：2017-06-15
Applicant: Seagate Technology LLC
Inventor： Alfredo Sam Chu , Siew Kin Chow , Franklin P. Martens
CPC classification number: G11B7/1263 , G06F11/0727 , G06F11/076 , G11B5/012 , G11B20/1816 , G11B2005/0021
Abstract: An operational laser power for a heat-assisted, magnetic recording head is selected based on a function of a write quality metric versus laser power. The write quality metric of data written to a magnetic recording medium is monitored at the operational laser power. Responsive to the write quality metric satisfying a threshold, a power difference between the operational laser power and an offset laser power is determined. The offset laser power corresponds to a point of the function where the write quality metric is approximately equal to the threshold. A maximum laser power is set for a calibration operation. The maximum laser power is based on the sum of the operational laser power and the power difference.
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公开(公告)号：US09396750B2
公开(公告)日：2016-07-19
申请号：US14852755
申请日：2015-09-14
Applicant: Seagate Technology LLC
Inventor： Alfredo Chu , Kenneth Arthur Haapala , Paul William Burnett , Siew Kin Chow
IPC: G11B11/00 , G11B13/08 , G11B7/1267 , G11B7/1263 , G11B5/48 , G11B5/60 , G11B5/31 , G11B5/09 , G11B5/00
CPC classification number: G11B13/08 , G11B5/09 , G11B5/314 , G11B5/4866 , G11B5/6088 , G11B7/1263 , G11B7/1267 , G11B2005/0021
Abstract: A system may have a data storage medium that contains at least one data bit that is accessed by a transducing head that has a near-field transducer. A controller can be connected to the transducing head and store a plurality of near-field transducer operating currents in a memory. The controller may identify a change in efficiency of the near-field transducer from the plurality of near-field transducer operating currents.
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公开(公告)号：US09142244B2
公开(公告)日：2015-09-22
申请号：US14185424
申请日：2014-02-20
Applicant: Seagate Technology LLC
Inventor： Alfredo Sam Chu , Kenneth Arthur Haapala , Paul William Burnett , Siew Kin Chow
CPC classification number: G11B13/08 , G11B5/09 , G11B5/314 , G11B5/4866 , G11B5/6088 , G11B7/1263 , G11B7/1267 , G11B2005/0021
Abstract: A system may have a data storage medium that contains at least one data bit that is accessed by a transducing head that has a near-field transducer. A controller can be connected to the transducing head and store a plurality of near-field transducer operating currents in a memory. The controller may identify a change in efficiency of the near-field transducer from the plurality of near-field transducer operating currents.
Abstract translation: 系统可以具有包含由具有近场换能器的换能头访问的至少一个数据位的数据存储介质。 控制器可以连接到转换头并将多个近场换能器工作电流存储在存储器中。 控制器可以从多个近场换能器工作电流中识别近场换能器的效率变化。
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8.发明授权公开(公告)号：US09093091B1
公开(公告)日：2015-07-28
申请号：US14492876
申请日：2014-09-22
Applicant: Seagate Technology LLC
Inventor： Alfredo Sam Chu , Siew Kin Chow
CPC classification number: G11B5/4866 , G11B5/012 , G11B5/314 , G11B5/455 , G11B5/6088 , G11B13/08 , G11B2005/0021
Abstract: A pattern is written to only a portion of a test track of a magnetic disk. The pattern written to the portion of the test track is read using a read head. A cross-track offset between the read head and a write head is determined at a position on a disk based on reading the pattern.
Abstract translation: 模式只写入磁盘测试轨道的一部分。 使用读取头读取写入测试轨迹部分的图案。 基于读取图案，在磁盘上的位置处确定读取头和写入头之间的跨轨道偏移。
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