公开(公告)号：US20160267930A1

公开(公告)日：2016-09-15

申请号：US14657313

申请日：2015-03-13

Applicant: Seagate Technology LLC

Inventor： Alfredo Sam Chu ,  Wenzhong Zhu

IPC: G11B5/48

CPC classification number: G11B5/4866 ,  G11B5/012 ,  G11B5/314 ,  G11B7/126 ,  G11B11/10595 ,  G11B2005/001 ,  G11B2005/0021

Abstract: A maximum write duration is determined for first and second heat-assisted write transducers of a data storage device. Exceeding the duration results in thermal degradation of the first and second write transducers. A request to write data to a heat-assisted recording medium is received. In response to a time to fulfill the request exceeding the maximum write duration, the data is divided into portions such that a respective writing of each of the portions does not exceed the maximum write duration. Writing successive ones of the portions to the heat-assisted recording medium involves alternating between the first and second write transducers.

Abstract translation: 为数据存储装置的第一和第二热辅助写换能器确定最大写持续时间。 超过持续时间导致第一和第二写入传感器的热劣化。 接收向热辅助记录介质写入数据的请求。 响应于满足超过最大写入持续时间的请求的时间，数据被分成使得每个部分的相应写入不超过最大写入持续时间的部分。 将连续的部分写入热辅助记录介质包括在第一和第二写入传感器之间交替。

公开(公告)号：US09361920B1

公开(公告)日：2016-06-07

申请号：US14626157

申请日：2015-02-19

Applicant: Seagate Technology LLC

Inventor： Wenzhong Zhu ,  Franklin P. Martens ,  Alfredo Sam Chu ,  Kaizhong Gao ,  Edward Charles Gage

IPC: G11B11/00 ,  G11B5/56 ,  G11B5/00 ,  G11B7/00 ,  G11B5/31

CPC classification number: G11B5/59627 ,  G11B5/314 ,  G11B5/455 ,  G11B5/5534 ,  G11B5/5565 ,  G11B7/00 ,  G11B2005/0021 ,  G11B2220/2525

Abstract: An offset from track center of data is determined in a data storage device. The data is written to a heat-assisted magnetic recording medium of the device, and the offset compensates for degradation of an optical component of a read/write head when writing the data. The offset is stored in a memory of the storage device. Using the offset, a track alignment is changed during subsequent writes via the read/write head.

Abstract translation: 在数据存储装置中确定数据的轨道中心的偏移。 该数据被写入该装置的热辅助磁记录介质，并且该偏移补偿了在写入数据时读/写头的光学部件的劣化。 偏移量存储在存储设备的存储器中。 使用偏移量，通过读/写头在后续写入期间改变轨迹对齐。

公开(公告)号：US09311951B1

公开(公告)日：2016-04-12

申请号：US14864202

申请日：2015-09-24

Applicant: Seagate Technology LLC

Inventor： Alfredo Sam Chu ,  Drew Michael Mader ,  Wenzhong Zhu ,  Michael A. Cordle

IPC: G11B7/1263 ,  G11B20/18 ,  G11B5/02 ,  G11B7/1267 ,  G11B5/00 ,  G11B5/455 ,  G11B5/012

CPC classification number: G11B7/1267 ,  G11B5/012 ,  G11B5/02 ,  G11B5/455 ,  G11B5/5534 ,  G11B13/08 ,  G11B20/10009 ,  G11B20/10481 ,  G11B20/10509 ,  G11B20/182 ,  G11B2005/0021

Abstract: During field operation of a heat-assisted magnetic recording data storage device, a laser adjustment procedure is repeatedly performed. The laser adjustment procedure involves writing, at a designated location on a recording medium at least three tracks at an unsqueezed pitch, a first track being in the middle of the at least three tracks. A first bit error rate of the first track is compared with a reference bit error rate. In response to the comparison satisfying a threshold, the laser current is swept while recording squeezed test tracks at the designated location to determine a new laser current that results in a minimum bit error rate. The new laser current is used for subsequent write operations.

Abstract translation: 在热辅助磁记录数据存储装置的现场操作期间，重复执行激光调节程序。 激光调整程序涉及在非压缩间距的至少三个轨道上在记录介质上的指定位置处写入至少三个轨道中间的第一轨道。 将第一轨道的第一误码率与参考误码率进行比较。 响应于满足阈值的比较，激光电流被扫描，同时在指定位置记录挤压的测试轨迹，以确定导致最小误码率的新的激光电流。 新的激光电流用于后续写入操作。

公开(公告)号：US20160055881A1

公开(公告)日：2016-02-25

申请号：US14512590

申请日：2014-10-13

Applicant: Seagate Technology LLC

Inventor： Michael A. Cordle ,  Franklin P. Martens ,  Alfredo Sam Chu ,  Shawn Stephen Silewski ,  Tim Rausch

IPC: G11B20/10 ,  G11B20/18 ,  G11B5/60 ,  G06F11/07

CPC classification number: G11B20/10388 ,  G06F11/073 ,  G06F11/076 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/40 ,  G11B5/455 ,  G11B5/5534 ,  G11B5/6088 ,  G11B19/048 ,  G11B20/1816 ,  G11B20/182 ,  G11B2005/0021

Abstract: A data storage device and associated methods may provide at least a data storage medium that is separated from a heat assisted magnetic recording data writer and is connected to a controller. The controller can be configured to change a laser power of the heat assisted magnetic recording data writer in response to a tested bit error rate of a median data track of a plurality of adjacent data tracks reaching an identified threshold.

Abstract translation: 数据存储装置和相关联的方法可以提供至少一个与热辅助磁记录数据写入器分离并连接到控制器的数据存储介质。 控制器可以被配置为响应于达到确定的阈值的多个相邻数据轨道的中值数据轨迹的测试误码率来改变热辅助磁记录数据写入器的激光功率。

公开(公告)号：US10147453B1

公开(公告)日：2018-12-04

申请号：US14882420

申请日：2015-10-13

Applicant: Seagate Technology LLC

Inventor： Alfredo Sam Chu ,  Franklin P Martens ,  Aaron Jacobs

IPC: G11B5/012 ,  G11B7/1267 ,  G11B5/00 ,  G11B5/455

Abstract: This disclosure is related to systems, devices, processes, and methods to optimize a laser power boost amplitude, a laser power boost duration, or both in a heat-assisted data recording device, such as in heat-assisted magnetic recording (HAMR). The amplitude and duration for the laser power boost may be determined for a specific portion of a write operation, such as a first sector of the write operation. During operation of a data storage device, the laser power boost may provide additional power to the laser for the specific portion. Once the laser power boost duration has elapsed, the data storage device may continue providing power to the laser at the normal power input range of the laser. The laser power boost settings may be determined on a per head per zone basis, per track basis, or another configuration.

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

IPC: G11B27/36 ,  G11B20/18 ,  G11B5/09 ,  G11B5/55 ,  G11B5/00

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.

公开(公告)号：US09704519B1

公开(公告)日：2017-07-11

申请号：US15040701

申请日：2016-02-10

Applicant: Seagate Technology LLC

Inventor： Wenzhong Zhu ,  Edward Charles Gage ,  Alfredo Sam Chu

IPC: G11B11/00 ,  G11B5/455 ,  G11B5/00 ,  G11B5/31 ,  G11B5/48 ,  G11B11/105 ,  G11B5/60

CPC classification number: G11B5/455 ,  G11B5/314 ,  G11B5/40 ,  G11B5/48 ,  G11B5/6088 ,  G11B11/10543 ,  G11B2005/0016 ,  G11B2005/0021

Abstract: For each head in a collection of heat-assisted magnetic recording read/write heads, a reader width and a writer width is measured. A predicted life is determined for each head based on the respective reader width and writer width. In a first set of drives having relatively fewer heads per drive, a first subset of the heads having a higher value of the predicted life are used. In a second set of drives having relatively more heads per drive, a second subset of the heads having a lower value of the predicted life are used.

公开(公告)号：US09679597B1

公开(公告)日：2017-06-13

申请号：US15205190

申请日：2016-07-08

Applicant: Seagate Technology LLC

Inventor： Wenzhong Zhu ,  Alfredo Sam Chu

IPC: G11B5/02 ,  G11B5/09 ,  G11B5/596 ,  G11B5/55 ,  G11B5/00

CPC classification number: G11B5/596 ,  G11B5/012 ,  G11B5/5526 ,  G11B2005/0021

Abstract: An apparatus and method involves a writer configured for heat-assisted magnetic recording of data to a magnetic storage medium. A controller is coupled to the writer. The controller and writer are configured to write data to a plurality of concentric bands of the medium each comprising a plurality of partially overlapping narrow data tracks and a wide track. The wide tracks of successive bands are positioned adjacent to one another with no intervening narrow data track therebetween.

公开(公告)号：US09653121B1

公开(公告)日：2017-05-16

申请号：US15073774

申请日：2016-03-18

Applicant: Seagate Technology LLC

Inventor： Alfredo Sam Chu ,  Wenzhong Zhu ,  Tim Rausch

IPC: G11B11/00 ,  G11B27/36 ,  G11B20/10 ,  G11B5/00 ,  G11B11/105 ,  G11B7/1263 ,  G11B7/126 ,  G11B7/1387

CPC classification number: G11B27/36 ,  G11B5/314 ,  G11B5/455 ,  G11B5/6088 ,  G11B7/126 ,  G11B7/1263 ,  G11B7/1387 ,  G11B11/105 ,  G11B11/10534 ,  G11B2005/0021

Abstract: A method comprises storing a first laser current value in response to a photodetector sensing that a threshold current for a laser diode of a HAMR head has been reached, the photodetector situated proximate the laser diode. The method also comprises storing a second laser current value in response to a sensor sensing that the threshold current for the laser diode has been reached, the sensor situated away from the laser diode. The method further comprises determining a difference (delta) between the first and second laser current values, repeating the storing and determining processes during subsequent use of the laser diode, and detecting a change in the delta indicative of a malfunction of the head.

公开(公告)号：US09508369B2

公开(公告)日：2016-11-29

申请号：US14657313

申请日：2015-03-13

Applicant: Seagate Technology LLC

Inventor： Alfredo Sam Chu ,  Wenzhong Zhu

IPC: G11B11/00 ,  G11B5/48 ,  G11B5/00 ,  G11B5/31 ,  G11B11/105 ,  G11B7/126

CPC classification number: G11B5/4866 ,  G11B5/012 ,  G11B5/314 ,  G11B7/126 ,  G11B11/10595 ,  G11B2005/001 ,  G11B2005/0021

Abstract: A maximum write duration is determined for first and second heat-assisted write transducers of a data storage device. Exceeding the duration results in thermal degradation of the first and second write transducers. A request to write data to a heat-assisted recording medium is received. In response to a time to fulfill the request exceeding the maximum write duration, the data is divided into portions such that a respective writing of each of the portions does not exceed the maximum write duration. Writing successive ones of the portions to the heat-assisted recording medium involves alternating between the first and second write transducers.

Abstract translation: 为数据存储装置的第一和第二热辅助写换能器确定最大写持续时间。 超过持续时间导致第一和第二写入传感器的热劣化。 接收向热辅助记录介质写入数据的请求。 响应于满足超过最大写入持续时间的请求的时间，数据被分成使得每个部分的相应写入不超过最大写入持续时间的部分。 将连续的部分写入热辅助记录介质涉及在第一和第二写入传感器之间交替。