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公开(公告)号：US10026443B1
公开(公告)日：2018-07-17
申请号：US15601056
申请日：2017-05-22
摘要： An error is determined in a target track of a heat-assisted recording medium. The error triggers an error recovery procedure. The error recovery procedure involves storing data from at least part of an adjacent track that is immediately proximate the target track to another data storage location. The error recovery procedure also involves, for two or more iterations in which a laser power is incrementally changed from a lower power to a higher power, erasing at least part of the adjacent track at the laser power and attempting to recover the target track.
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2.发明授权公开(公告)号：US09792949B1
公开(公告)日：2017-10-17
申请号：US15414288
申请日：2017-01-24
发明人： Minjie Ma , Tim Rausch , Edward Charles Gage , Pu-Ling Lu
IPC分类号： G11B11/00 , G11B20/18 , G11B5/00 , G11B7/1267 , G11B5/09
CPC分类号： G11B20/1816 , G11B5/09 , G11B5/455 , G11B7/1267 , G11B20/10305 , G11B2005/0021
摘要： An apparatus and method provide for performing, using a heat-assisted magnetic recording head, multiple sequential writes to a recording medium, and recording a metric of write performance for each of the writes. The apparatus and method further provide for calculating fluctuations in the metric, detecting whether the head has a laser mode hopping problem using the metric fluctuations, and categorizing a severity of the laser mode hopping problem.
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3.发明授权公开(公告)号：US09595288B1
公开(公告)日：2017-03-14
申请号：US15155973
申请日：2016-05-16
IPC分类号： G11B27/36 , G11B7/1267 , G11B5/00
CPC分类号： G11B7/1267 , G11B5/02 , G11B5/40 , G11B5/455 , G11B2005/0021
摘要： A method comprises performing a write operation using a heat-assisted magnetic recording (HAMR) drive operating at a plurality of temperatures. The method involves measuring a metric of write performance subsequent to the write operation at each of the operating temperatures. The method also involves detecting one or more laser mode hops using the metrics, and determining a temperature at which each of the detected mode hops occurred. The method further involves storing the temperature for each detected mode hop in a non-volatile memory of the drive. The method may involve mitigating laser mode hopping, such as by the drive avoiding the stored temperature(s).
摘要翻译： 一种方法包括使用在多个温度下操作的热辅助磁记录（HAMR）驱动来执行写入操作。 该方法包括测量在每个工作温度下的写入操作之后的写入性能的度量。 该方法还涉及使用度量来检测一个或多个激光模式跳跃，并且确定每个检测到的模式跳跃发生的温度。 该方法还包括将每个检测到的模式跳跃的温度存储在驱动器的非易失性存储器中。 该方法可以包括减轻激光模式跳频，例如通过驱动器避免存储的温度。
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4.发明授权Laser mode hopping detection method and apparatus for a heat-assisted magnetic recording device 有权用于热辅助磁记录装置的激光模式跳频检测方法和装置公开(公告)号：US09583135B1
公开(公告)日：2017-02-28
申请号：US15139516
申请日：2016-04-27
发明人： Minjie Ma , Tim Rausch , Edward Charles Gage , Pu-Ling Lu
CPC分类号： G11B20/1816 , G11B5/09 , G11B5/455 , G11B7/1267 , G11B20/10305 , G11B2005/0021
摘要： An apparatus and method provide for performing, using a heat-assisted magnetic recording head, multiple sequential writes to a recording medium, and recording a metric of write performance for each of the writes. The apparatus and method further provide for calculating fluctuations in the metric, detecting whether the head has a laser mode hopping problem using the metric fluctuations, and categorizing a severity of the laser mode hopping problem.
摘要翻译： 一种装置和方法，用于使用热辅助磁记录头对记录介质执行多次顺序写入，并且记录每个写入的写入性能的度量。 该装置和方法还提供用于计算度量的波动，检测头是否具有使用度量波动的激光模式跳跃问题，以及对激光模式跳跃问题的严重性进行分类。
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5.发明申请公开(公告)号：US20170316804A1
公开(公告)日：2017-11-02
申请号：US15414288
申请日：2017-01-24
发明人： Minjie Ma , Tim Rausch , Edward Charles Gage , Pu-Ling Lu
IPC分类号： G11B20/18 , G11B5/09 , G11B7/1267 , G11B5/00
CPC分类号： G11B20/1816 , G11B5/09 , G11B5/455 , G11B7/1267 , G11B20/10305 , G11B2005/0021
摘要： An apparatus and method provide for performing, using a heat-assisted magnetic recording head, multiple sequential writes to a recording medium, and recording a metric of write performance for each of the writes. The apparatus and method further provide for calculating fluctuations in the metric, detecting whether the head has a laser mode hopping problem using the metric fluctuations, and categorizing a severity of the laser mode hopping problem.
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6.发明授权公开(公告)号：US09390738B1
公开(公告)日：2016-07-12
申请号：US14723802
申请日：2015-05-28
CPC分类号： G11B5/4866 , G11B5/012 , G11B5/02 , G11B5/1871 , G11B5/3116 , G11B5/314 , G11B5/483 , G11B5/4873 , G11B5/4886 , G11B5/6088 , G11B7/1387 , G11B13/08 , G11B2005/0021
摘要： Bits are written to a track of a heat-assisted magnetic recording medium via a write transducer at a first skew angle. The track is read via a read transducer oriented at a second skew angle different from the first skew angle. The second skew angle causes the read transducer be more closely aligned with boundaries of the bits than if oriented at the first skew angle.
摘要翻译： 通过写入传感器以第一歪斜角将位写入热辅助磁记录介质的轨迹。 通过以与第一倾斜角度不同的第二倾斜角度定向的读取传感器读取轨道。 第二偏斜角度使得读取换能器与位于第一偏斜角的方向相比更接近于比特边界。
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7.发明授权Write parameters used to ensure accurate phase lock during reading of a heat-assisted magnetic recording medium 有权写入参数，以确保读取热辅助磁记录介质时的精确锁相公开(公告)号：US09240205B1
公开(公告)日：2016-01-19
申请号：US14624100
申请日：2015-02-17
发明人： Kaizhong Gao , Pu-Ling Lu , Edward Charles Gage , Wenzhong Zhu
CPC分类号： G11B7/1263 , G11B5/012 , G11B5/02 , G11B5/3133 , G11B5/455 , G11B5/4866 , G11B5/59616 , G11B5/6011 , G11B5/6088 , G11B2005/0021
摘要： Based on thermal time constant of a head-to-media spacing of a write head, a write parameter is determined that includes at least one of: a modified laser power boost used at a beginning of writing; and a time adjustment affecting the beginning of the writing. The write parameter is applied to writing operations affecting a heat-assisted magnetic recording medium, the write parameter ensuring accurate phase lock during reading of the heat-assisted magnetic recording medium.
摘要翻译： 基于写头的头对媒体间隔的热时间常数，确定写入参数，其包括以下中的至少一个：在写入开始时使用的修改的激光功率提升; 以及影响写作开始的时间调整。 写入参数适用于影响热辅助磁记录介质的写入操作，写入参数确保在读取热辅助磁记录介质期间精确锁相。
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公开(公告)号：US09236081B1
公开(公告)日：2016-01-12
申请号：US14674360
申请日：2015-03-31
发明人： Alfredo S. Chu , Jason W. Riddering , Drew M. Mader , Huazhou Lou , Pu-Ling Lu
IPC分类号： G11B11/00 , G11B7/1267 , G11B11/105 , G11B7/1263 , G11B7/12 , G11B5/48 , G11B5/60
CPC分类号： G11B7/1263 , G11B5/012 , G11B5/455 , G11B5/4866 , G11B5/6088 , G11B11/10595 , G11B2005/0021
摘要： A method includes setting a heat assisted magnetic recording (HAMR) device located in a data storage system having a laser to an operating temperature. A threshold laser current is determined. An optimal laser current is determined. The threshold laser current and the optimal laser current are stored in memory. The steps of determining a threshold laser current, determining an optimal laser current and storing the threshold laser current and the optimal laser current into the calibration table are repeated until acceptable device performance is achieved at more than one operating temperature.
摘要翻译： 一种方法包括将位于具有激光的数据存储系统中的热辅助磁记录（HAMR）装置设置到工作温度。 确定阈值激光电流。 确定最佳激光电流。 阈值激光电流和最佳激光电流存储在存储器中。 重复确定阈值激光电流，确定最佳激光电流并将阈值激光电流和最佳激光电流存储到校准表中的步骤，直到在多于一个工作温度下实现可接受的器件性能。
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