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1.发明申请公开(公告)号：US20180330754A1
公开(公告)日：2018-11-15
申请号：US15594812
申请日：2017-05-15
CPC分类号： G11B13/045 , G11B5/6088 , G11B7/126 , G11B13/08 , G11B20/1816 , G11B2005/0021
摘要： An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.
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公开(公告)号：US09966100B1
公开(公告)日：2018-05-08
申请号：US15671262
申请日：2017-08-08
IPC分类号： G11B5/02 , G11B7/00 , G11B7/1263 , G11B5/012 , H01S5/042 , H01S5/0683 , G11B5/00
CPC分类号： G11B5/012 , G11B2005/0021 , H01S5/0427 , H01S5/0683
摘要： Before writing to a heat-assisted magnetic recording medium, a DC signal modulated with an AC signal is applied to a laser of a read/write head. A modulation level of an optical power sensor is measured, the optical power sensor being coupled to detect optical output of the laser in response to the modulated current. A target value of the DC signal that causes the modulation levels to reach a predetermined value between zero and a maximum value is determined and used to set a bias current for subsequent activation of the laser based.
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公开(公告)号：US10777224B2
公开(公告)日：2020-09-15
申请号：US16556501
申请日：2019-08-30
发明人： Timothy Francis Ellis , Gary Ernest Hillukka , Joshua Ward Christensen , Puskal Prasad Pokharel
摘要： Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).
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公开(公告)号：US20190385640A1
公开(公告)日：2019-12-19
申请号：US16556501
申请日：2019-08-30
发明人： Timothy Francis ELLIS , Gary Ernest HILLUKKA , Joshua Ward Christensen , Puskal Prasad POKHAREL
摘要： Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).
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公开(公告)号：US10366722B1
公开(公告)日：2019-07-30
申请号：US15978432
申请日：2018-05-14
发明人： Riyan Mendonsa , James Dillon Kiely , Joshua Ward Christensen , Jon D. Trantham , Chad Robert Barry , Tim Rausch
IPC分类号： G11B11/00 , G11B7/1263 , G11B5/00 , G11B7/1267 , G11B5/60 , G11B7/126
摘要： An apparatus comprises a laser diode configured to generate modulated light during a write operation in response to receiving modulated current having a mean amplitude that varies or is constant. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A writer heater of the slider is configured to receive power during the write operation having a magnitude that varies or is constant. A sensor is situated on or within the slider. The sensor is configured to produce a sensor signal representative of output optical power of the laser diode. Measuring circuitry is coupled to the sensor and configured to measure a change in the sensor signal indicative of a laser mode hop during the write operation.
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6.发明申请公开(公告)号：US20180114542A1
公开(公告)日：2018-04-26
申请号：US15671262
申请日：2017-08-08
IPC分类号： G11B7/1263 , H01S5/0683 , G11B5/012 , H01S5/042 , G11B5/00
CPC分类号： G11B5/012 , G11B2005/0021 , H01S5/0427 , H01S5/0683
摘要： Before writing to a heat-assisted magnetic recording medium, a DC signal modulated with an AC signal is applied to a laser of a read/write head. A modulation level of an optical power sensor is measured, the optical power sensor being coupled to detect optical output of the laser in response to the modulated current. A target value of the DC signal that causes the modulation levels to reach a predetermined value between zero and a maximum value is determined and used to set a bias current for subsequent activation of the laser based.
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公开(公告)号：US11164598B1
公开(公告)日：2021-11-02
申请号：US17218317
申请日：2021-03-31
发明人： Anil Kashyap , Jason Charles Jury , Joshua Ward Christensen , Brian T. Edgar , Mark A. Gaertner
摘要： A method includes writing first data on a first track of a data storage surface, and storing information for the first data in a memory other than the data storage surface. The method also includes performing a write operation on a second track of the data storage surface after the data is written on the first track. The second track is adjacent to the first track. The method further includes identifying potentially-overwritten sectors of the first track as a result of the performance of the write operation on the second track, and performing a first read operation on the identified potentially-overwritten sectors of the first track after completion of the write operation on the second track. Second data associated with the identified potentially-overwritten sectors is then stored in a solid-state memory, and mirrored to media.
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公开(公告)号：US20190295579A1
公开(公告)日：2019-09-26
申请号：US15936215
申请日：2018-03-26
发明人： Timothy Francis ELLIS , Gary Ernest HILLUKKA , Joshua Ward Christensen , Puskal Prasad POKHAREL
摘要： Systems and methods for servo zone transition optimization are described. In one embodiment, the storage system device includes a disk drive and a controller. In some embodiments, the controller may be configured to assess at least one operation of a read/write head of the disk drive; and format, based at least in part on the assessing of the read/write head, a disk surface of the disk drive with a first servo zone, a second servo zone, and an overlap region extending between a start point of the second servo zone and an end point of the first servo zone. In some cases, the overlap region starts towards a disk inner diameter (ID) and ends towards a disk outer diameter (OD).
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公开(公告)号：US10147454B1
公开(公告)日：2018-12-04
申请号：US15594812
申请日：2017-05-15
摘要： An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.
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10.发明授权公开(公告)号：US10083716B1
公开(公告)日：2018-09-25
申请号：US15678440
申请日：2017-08-16
IPC分类号： G11B11/00 , G11B7/1267 , G11B20/12 , G11B5/455 , G11B5/00 , G11B7/126 , G11B7/1263 , G11B5/60
CPC分类号： G11B7/1267 , G11B5/455 , G11B5/5534 , G11B5/6088 , G11B7/126 , G11B7/1263 , G11B20/10027 , G11B20/1217 , G11B2005/0021 , G11B2020/1232
摘要： A heat-assisted magnetic recording head is moved relative to a magnetic recording medium. The medium comprises a plurality of sectors. The sectors define a plurality of sector groups distributed around a circumference of the medium. The sectors of each sector group are written using different operational currents supplied to a laser diode of the head such that at least one sector from each sector group is written using one of the different operational currents. For each of the different operational currents, an average write performance metric is calculated for all sectors written at each of the different operational currents. A particular operational current of the different operational currents is determined that results in a best average write performance metric.
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