公开(公告)号：US08797664B1

公开(公告)日：2014-08-05

申请号：US13726007

申请日：2012-12-22

申请人： Western Digital Technologies, Inc.

发明人： Hengchang Guo ,  Duc T. Phan ,  Yanan Huang ,  Chuanwen Ji ,  Yakov M. Lifschitz

IPC分类号： G11B27/36

CPC分类号： G11B5/455 ,  G11B5/483

摘要： Determining a polarity of a piezoelectric (PZT) actuator of a disk drive including a disk for storing data and a head for reading and writing data. A test signal is injected into the PZT actuator and a position signal is received which indicates a position of the head over the disk resulting from the test signal. A test compensation signal is generated based on the received position signal and the polarity of the PZT actuator is determined based on a phase of the generated test compensation signal.

摘要翻译： 确定包括用于存储数据的盘的磁盘驱动器的压电（PZT）致动器的极性和用于读取和写入数据的磁头。 测试信号被注入到PZT执行器中，并且接收一个位置信号，该位置信号指示由测试信号产生的磁头在磁盘上的位置。 基于接收的位置信号产生测试补偿信号，并且基于生成的测试补偿信号的相位来确定PZT致动器的极性。

公开(公告)号：US08743503B1

公开(公告)日：2014-06-03

申请号：US13794263

申请日：2013-03-11

申请人： Western Digital Technologies, Inc.

发明人： Shan Tang ,  Hengchang Guo

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by servo sectors. The head is positioned over a first servo track, and a first position error signal (PES) by reading a first servo sector during a first revolution of the disk and in response to a first compensation value. A second compensation value is updated for a second servo sector based on the first PES during the first revolution of the disk. A second PES is generated by reading the second servo sector during the first revolution of the disk and in response to the updated second compensation value. The first compensation value is updated for the first servo sector based on the second PES during the first revolution of the disk. The head is actuated over the disk in response to the first PES and the second PES.

摘要翻译： 公开了一种磁盘驱动器，其包括在包括由伺服扇区限定的多个伺服磁道的盘上驱动的磁头。 头部通过在盘的第一次旋转期间读取第一伺服扇区并且响应于第一补偿值而位于第一伺服轨道上，以及第一位置误差信号（PES）。 在盘的第一次旋转期间，基于第一PES，为第二伺服扇区更新第二补偿值。 通过在盘的第一次旋转期间读取第二伺服扇区并响应于更新的第二补偿值来产生第二PES。 在盘的第一次旋转期间，基于第二PES，针对第一伺服扇区更新第一补偿值。 响应于第一PES和第二PES，头被驱动到盘上。