公开(公告)号：US09214186B1

公开(公告)日：2015-12-15

申请号：US14666118

申请日：2015-03-23

申请人： Western Digital Technologies, Inc.

发明人： Phillip Scott Haralson

IPC分类号： G11B21/02 ,  G11B5/596 ,  G11B20/10

CPC分类号： G11B7/1267 ,  G11B5/02 ,  G11B5/455 ,  G11B5/5534 ,  G11B7/00736 ,  G11B7/1263 ,  G11B20/10009 ,  G11B20/10305 ,  G11B20/10472 ,  G11B20/10481 ,  G11B2005/0021

摘要： A data storage device is disclosed comprising a disk comprising a plurality of tracks and a head actuated over the disk, wherein the head comprises a read element radially offset from a write element. A first pattern is written to a single track, and the first pattern is read from the single track to generate a first read signal from which a first quality metric is generated. A second pattern is written to the single track, wherein the second pattern is different from the first pattern. The second pattern is read from the single track to generate a second read signal from which a second quality metric is generated. The radial offset of the read element and write element is measured based on the first and second quality metrics.

摘要翻译： 公开了一种数据存储装置，其包括：盘，其包括多个轨道和在该盘上致动的头部，其中头部包括从写入元件径向偏移的读取元件。 将第一模式写入单个磁道，并且从单个磁道读取第一模式以产生从其产生第一质量度量的第一读取信号。 将第二图案写入单个轨道，其中第二图案与第一图案不同。 从单个轨道读取第二图案以产生第二读取信号，从该第二读取信号生成第二个质量度量。 基于第一和第二质量度量来测量读取元件和写入元件的径向偏移。

公开(公告)号：US09842617B1

公开(公告)日：2017-12-12

申请号：US14754340

申请日：2015-06-29

申请人： Western Digital Technologies, Inc.

发明人： Phillip Scott Haralson ,  Galvin T. P. Chia ,  Steven R. Vasquez ,  Mark McDaniel

IPC分类号： G11B5/02 ,  G11B15/12 ,  G11B19/02 ,  G11B5/60 ,  G11B5/00

CPC分类号： G11B5/6029 ,  G11B5/6011 ,  G11B2005/0021

摘要： An apparatus includes: a media; a heat assisted magnetic recording (HAMR) head over the media; and control circuitry, coupled to the HAMR head, the control circuitry being configured to: receive a write command to write the media; apply a dynamic flying height (DFH) control before asserting a write gate of the HAMR head; assert the write gate to the HAMR head; and enable a flying height compensation mechanism to maintain a constant value of a flying height of the HAMR head over the media during a next assertion of the write gate.

公开(公告)号：US09384774B1

公开(公告)日：2016-07-05

申请号：US14666080

申请日：2015-03-23

申请人： Western Digital Technologies, Inc.

发明人： Poornima Nookala ,  Phillip Scott Haralson

IPC分类号： G11B7/00 ,  G11B20/10 ,  G11B7/1267 ,  G11B7/007 ,  G11B7/1263

CPC分类号： G11B7/1267 ,  G11B5/02 ,  G11B5/455 ,  G11B5/5534 ,  G11B7/00736 ,  G11B7/1263 ,  G11B20/10009 ,  G11B20/10305 ,  G11B20/10472 ,  G11B20/10481 ,  G11B2005/0021

摘要： A data storage device is disclosed comprising a disk and a head actuated over the disk, wherein the head comprises a laser configured to heat the disk while writing data to the disk. The laser power is adjusted and a pattern is written to a target track at the adjusted laser power. The pattern is read from the target track to generate a read signal, and a quality metric is generated based on the read signal. The process is repeated at least once, and a write power for the laser is configured based on a slope of the quality metric.

摘要翻译： 公开了一种数据存储装置，包括盘和在盘上致动的头，其中头部包括被配置为在将数据写入盘时加热盘的激光器。 激光功率被调节，并且以调节的激光功率将图案写入目标轨道。 从目标轨道读取模式以产生读取信号，并且基于读取信号产生质量度量。 该过程重复至少一次，并且基于质量度量的斜率来配置激光器的写入功率。