公开(公告)号：US09286925B1

公开(公告)日：2016-03-15

申请号：US14669994

申请日：2015-03-26

Applicant: Western Digital Technologies, Inc.

Inventor： Stanley H. Shepherd ,  Yakov M. Lifschitz ,  Min Chen ,  Guoxiao Guo ,  Jason Laks

IPC: G11B5/09 ,  G11B27/36 ,  G11B5/596

CPC classification number: G11B5/59627 ,  G11B5/59688

Abstract: A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by servo bursts. The head is positioned at a first radial location over the disk and a first burst correction value is generated by reading at least one of the servo bursts. The head is positioned at a second radial location over the disk and a second burst correction value is generated by reading at least one of the servo bursts. The head is positioned at a third radial location over the disk and the first burst correction value and the second burst correction value are written at the third radial location. The head is servoed over the disk by reading the first and second burst correction values.

Abstract translation: 公开了一种数据存储装置，其包括在盘上致动的磁头，该磁头包括由伺服脉冲串定义的多个伺服磁道。 头部位于盘的第一径向位置，并且通过读取至少一个伺服脉冲串来产生第一突发校正值。 头部位于盘的第二径向位置，并且通过读取至少一个伺服脉冲串来产生第二突发校正值。 头部位于盘的第三径向位置，并且第一突发校正值和第二突发校正值被写入第三径向位置。 通过读取第一和第二突发校正值来将磁头伺服在磁盘上。

公开(公告)号：US08941939B1

公开(公告)日：2015-01-27

申请号：US14090732

申请日：2013-11-26

Applicant: Western Digital Technologies, Inc.

Inventor： Brian P. Rigney ,  Jianbin Nie ,  Stanley H. Shepherd

IPC: G11B5/02 ,  G11B5/55

CPC classification number: G11B5/5547 ,  G11B5/59661

Abstract: A disk drive is disclosed comprising a voice coil motor (VCM) configured to actuate a head over a disk. The VCM is controlled to seek the head over the disk during a first seek, and a back electromotive force (BEMF) voltage generated by the VCM during the first seek is measured. Feed-forward compensation is generated based on the measured BEMF voltage, and the VCM is controlled to seek the head over the disk during a second seek using the feed-forward compensation while writing servo data to the disk.

Abstract translation: 公开了一种磁盘驱动器，其包括配置成在盘上致动磁头的音圈电机（VCM）。 控制VCM在第一次寻找期间在磁盘上寻找磁头，并且测量在第一次寻找期间由VCM产生的反电动势（BEMF）电压。 基于测量的BEMF电压产生前馈补偿，并且在将伺服数据写入盘时，使用前馈补偿在第二次寻找期间控制VCM以寻找磁头。

公开(公告)号：US08970978B1

公开(公告)日：2015-03-03

申请号：US13657016

申请日：2012-10-22

Applicant: Western Digital Technologies, Inc.

Inventor： Bernhard E. Knigge ,  Stanley H. Shepherd ,  Noureddine Kermiche

IPC: G11B5/60

CPC classification number: G11B5/6076 ,  G11B5/6029 ,  G11B5/607

Abstract: A disk drive is disclosed comprising a head actuated over a disk, and a dynamic fly height (DFH) actuator operable to control a fly height of the head over the disk. A DFH control signal is applied to the DFH actuator to decrease the fly height of the head, wherein the DFH control signal comprises a DC component and an AC component comprising an excitation frequency. A touchdown metric is measured over an interval, and the head contacting the disk is detected in response to a frequency component of the touchdown metric at the excitation frequency.

Abstract translation: 公开了一种磁盘驱动器，其包括在盘上致动的磁头，以及可操作以控制磁头在磁盘上的飞行高度的动态飞行高度（DFH）致动器。 DFH控制信号被施加到DFH致动器以降低磁头的飞行高度，其中DFH控制信号包括DC分量和包括激励频率的AC分量。 在一个间隔上测量触地度量，并且响应于激励频率处的触地度量的频率分量来检测接触磁盘的磁头。