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公开(公告)号：US09916849B1
公开(公告)日：2018-03-13
申请号：US15347129
申请日：2016-11-09
发明人： Drew Michael Mader , Tim Rausch , James E. Angelo
IPC分类号： G11B11/00 , G11B7/1263 , G11B7/126 , G11B5/00 , G11B5/60 , G11B11/105 , G11B7/1267
CPC分类号： G11B7/126 , G11B5/012 , G11B5/6088 , G11B7/1267 , G11B11/10506 , G11B11/1051 , G11B2005/0021
摘要： An optical power level applied via a laser when recording data to a track of a heat-assisted recording medium is determined. In response to the optical power level being too low or too high, remedial action is taken to prevent loss of data on one or more of the track and an adjacent track.
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公开(公告)号：US20190287554A1
公开(公告)日：2019-09-19
申请号：US16170445
申请日：2018-10-25
发明人： Alfredo Sam Chu , Franklin P. Martens , Drew Michael Mader , Steven J. Kimble , James E. Angelo
摘要： A temperature compensation equation is generated during manufacture of a heat-assisted magnetic recording (HAMR) disk drive using initial total currents supplied to a laser diode of the disk drive at different initial operating temperatures. The total currents represent currents for recording data to or erasing data from the medium. The temperature compensation equation is stored in the disk drive, and updated, during field operation, using a subsequent total current associated with an operating temperature differing from the initial operating temperatures. The total current supplied to the laser diode for a subsequent write operation is adjusted using the updated temperature compensation equation in response to the operating temperature at the time of the subsequent write operation.
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公开(公告)号：US10127930B1
公开(公告)日：2018-11-13
申请号：US15919386
申请日：2018-03-13
发明人： Alfredo Sam Chu , Franklin P. Martens , Drew Michael Mader , Steven J. Kimble , James E. Angelo
摘要： A temperature compensation equation is generated during manufacture of a heat-assisted magnetic recording (HAMR) disk drive using initial total currents supplied to a laser diode of the disk drive at different initial operating temperatures. The total currents represent currents for recording data to or erasing data from the medium. The temperature compensation equation is stored in the disk drive, and updated, during field operation, using a subsequent total current associated with an operating temperature differing from the initial operating temperatures. The total current supplied to the laser diode for a subsequent write operation is adjusted using the updated temperature compensation equation in response to the operating temperature at the time of the subsequent write operation.
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公开(公告)号：US10971177B1
公开(公告)日：2021-04-06
申请号：US16887007
申请日：2020-05-29
摘要： A first heat-assisted magnetic recording (HAMR) writer writes to a surface of a magnetic disk using during an initial time period. A second HAMR writer is configured to write to the surface but not during the initial time period. The initial time period extends from a first time when the disk drive is first used to a second time when a near-field transducer of the first HAMR writer reaches a first wear threshold. During a subsequent time period after the initial time period, to the surface of the disk is written to using the second HAMR writer and not the first HAMR writer.
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公开(公告)号：US10395673B1
公开(公告)日：2019-08-27
申请号：US16170445
申请日：2018-10-25
发明人： Alfredo Sam Chu , Franklin P. Martens , Drew Michael Mader , Steven J. Kimble , James E. Angelo
摘要： A temperature compensation equation is generated during manufacture of a heat-assisted magnetic recording (HAMR) disk drive using initial total currents supplied to a laser diode of the disk drive at different initial operating temperatures. The total currents represent currents for recording data to or erasing data from the medium. The temperature compensation equation is stored in the disk drive, and updated, during field operation, using a subsequent total current associated with an operating temperature differing from the initial operating temperatures. The total current supplied to the laser diode for a subsequent write operation is adjusted using the updated temperature compensation equation in response to the operating temperature at the time of the subsequent write operation.
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公开(公告)号：US09842621B1
公开(公告)日：2017-12-12
申请号：US15246835
申请日：2016-08-25
发明人： Drew Michael Mader , Tim Rausch , James E. Angelo
IPC分类号： G11B11/00 , G11B20/10 , G11B20/18 , G11B5/012 , G11B7/126 , G11B5/00 , G11B7/1267 , G11B7/1263 , G11B5/60 , G11B11/105
CPC分类号： G11B20/105 , G11B5/012 , G11B5/6088 , G11B7/126 , G11B7/1263 , G11B7/1267 , G11B11/10506 , G11B11/1051 , G11B20/10009 , G11B20/1816 , G11B2005/0021
摘要： An apparatus determines that phase errors have exceeded a threshold when reading data previously recorded to a heat-assisted recording medium. In response to the phase errors exceeding the threshold, remedial action is taken to prevent loss of data due changes in power applied to heat the heat-assisted recording medium when recording.
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