公开(公告)号：US08830617B1

公开(公告)日：2014-09-09

申请号：US13925798

申请日：2013-06-24

申请人： Western Digital Technologies, Inc.

发明人： Aswartha Narayana ,  Yanan Huang

IPC分类号： G11B5/55

CPC分类号： G11B5/5547

摘要： A disk drive is disclosed comprising a disk comprising tracks defined by servo sectors, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk based on the servo sectors. An estimated acceleration EstAccel of the head over the disk is generated based on at least one of the servo sectors. When the EstAccel is determined to be reliable, an estimated velocity EstVel of the head over the disk is generated based on the EstAccel. When the EstAccel is determined to be unreliable, the EstAccel is adjusted to generate an adjusted acceleration AdjAccel and the EstVel of the head over the disk is generated based on the AdjAccel.

摘要翻译： 公开了一种磁盘驱动器，包括包括由伺服扇区定义的轨道的磁盘，磁头和包括伺服控制系统的控制电路，所述伺服控制系统可操作以基于所述伺服扇区来驱动磁头。 基于至少一个伺服扇区产生磁头上磁头的估计加速度EstAccel。 当EstAccel被确定为可靠时，基于EstAccel生成磁盘上磁头的估计速度EstVel。 当EstAccel被确定为不可靠时，调整EstAccel以生成调整加速度AdjAccel，并且基于AdjAccel生成磁盘头部的EstVel。

公开(公告)号：US09355666B1

公开(公告)日：2016-05-31

申请号：US14733027

申请日：2015-06-08

申请人： Western Digital Technologies, Inc.

发明人： Yanan Huang ,  Zhenyu Zhang ,  Chuanwen Ji ,  Duc T. Phan

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59627 ,  G11B21/12

摘要： A data storage device is disclosed comprising a plurality of disk surfaces including a first disk surface and a second disk surface. A first head is actuated over the first disk surface, and a second head is actuated over the second disk surface. A ramp is located proximate an outer diameter of the disk surfaces. A stroke difference between the first and second heads is measured by moving the first and second heads toward the ramp and detecting when the heads contact the ramp.

摘要翻译： 公开了一种包括多个盘表面的数据存储装置，包括第一盘表面和第二盘表面。 第一头在第一盘表面上被致动，并且第二头在第二盘表面上被致动。 斜面位于盘表面的外径附近。 通过将第一和第二磁头移向斜坡并检测磁头何时接触斜坡来测量第一和第二磁头之间的行程差。

公开(公告)号：US08913338B1

公开(公告)日：2014-12-16

申请号：US13924791

申请日：2013-06-24

申请人： Western Digital Technologies, Inc.

发明人： Alain Chahwan ,  Yanan Huang ,  Chuanwen Ji

IPC分类号： G11B19/04 ,  G11B5/596

CPC分类号： G11B19/045 ,  G11B5/59627 ,  G11B5/59688

摘要： A disk drive is disclosed comprising a disk comprising a plurality of servo tracks defined by servo sectors, wherein each servo sector comprises servo data and a servo compensation value. While servoing a head over a target data track during a write operation, a position error signal (PES) is generated at each servo sector based at least in part on the servo data. When the servo compensation value of a first servo sector is recoverable, the write operation is aborted when the PES generated at the first servo sector exceeds a first write unsafe threshold. When the servo compensation value of the first servo sector is unrecoverable, the write operation is aborted when the PES generated at the first servo sector exceeds a second write unsafe threshold less than the first write unsafe threshold.

摘要翻译： 公开了一种磁盘驱动器，其包括由伺服扇区定义的多个伺服磁道的盘，其中每个伺服扇区包括伺服数据和伺服补偿值。 当在写入操作期间在目标数据轨道上伺服头部时，至少部分地基于伺服数据在每个伺服扇区处产生位置误差信号（PES）。 当第一伺服扇区的伺服补偿值可恢复时，当在第一伺服扇区处产生的PES超过第一写不安全阈值时，写操作被中止。 当第一伺服扇区的伺服补偿值不可恢复时，当在第一伺服扇区处产生的PES超过低于第一写不安全阈值的第二写不安全阈值时，写操作被中止。

公开(公告)号：US08902538B1

公开(公告)日：2014-12-02

申请号：US13932705

申请日：2013-07-01

申请人： Western Digital Technologies, Inc.

发明人： Yanning Liu ,  Nathan J. Santee ,  Yi Lu ,  Yanan Huang ,  Toviah N. Hirschberg

IPC分类号： G11B5/596 ,  G11B21/02 ,  G11B27/36 ,  G11B5/455

CPC分类号： G11B5/455 ,  G11B5/4873 ,  G11B5/5552 ,  G11B5/59688

摘要： A disk drive is disclosed comprising a disk media, a head stack assembly (HSA) having a head coupled to its distal end, a microactuator used to provide fine position of the head and a voice coil motor (VCM) configured to actuate the HSA over the disk media, and control circuitry. The control circuitry may be configured to move the HSA in an alternating manner across the disk media while actuating the microactuator. One or more performance characteristics of the microactuator may be measured before and after the actuation of the microactuator, and failure may be detected based on the absolute or relative change of the one or more performance characteristics.

摘要翻译： 公开了一种磁盘驱动器，其包括磁盘介质，具有与其远端连接的磁头的磁头堆叠组件（HSA），用于提供磁头精细位置的微致动器和配置成致动HSA的音圈电机（VCM） 磁盘介质和控制电路。 控制电路可以被配置为在致动微致动器的同时以交替的方式跨越盘介质移动HSA。 可以在致动微致动器之前和之后测量微致动器的一个或多个性能特征，并且可以基于一个或多个性能特性的绝对或相对变化来检测故障。

公开(公告)号：US09099133B1

公开(公告)日：2015-08-04

申请号：US13752693

申请日：2013-01-29

申请人： Western Digital Technologies, Inc.

发明人： Shan Tang ,  Lu Feng ,  Yanan Huang ,  Alexander Babinski ,  Min Chen ,  Orhan Beker

IPC分类号： G11B21/02 ,  G11B5/02 ,  G11B5/58 ,  G11B5/55

CPC分类号： G11B5/553 ,  G11B5/59622

摘要： A disk drive is disclosed comprising a disk comprising a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors, and an actuator for actuating a head over the disk in response to an actuator control signal. The servo sectors are read to generate a first sequence of control samples x[k] at a sample frequency corresponding to a frequency of the servo sectors. A hybrid upsample filter is used to upsample by a factor of N the first sequence of control samples x[k] to generate a second sequence of control samples y[ki], wherein the hybrid upsample filter provides a higher phase gain than a zero-order type upsample filter at frequencies less than one kilohertz, and approximately the same attenuation as a first-order type upsample filter around the sample frequency. The actuator control signal is generated in response to the second sequence of control samples y[ki].

摘要翻译： 公开了一种磁盘驱动器，其包括包括多个伺服磁道的磁盘，其中每个伺服磁道包括多个伺服扇区，以及用于响应于致动器控制信号而将磁头驱动到磁盘上的致动器。 读取伺服扇区以在对应于伺服扇区的频率的采样频率处产生第一控制样本序列x [k]。 混合上采样滤波器用于以N个因子对第一个控制样本x [k]序列进行上采样，以产生第二个控制采样序列y i，其中混合上采样滤波器提供比零 - 频率小于1千赫兹的订单型上采样滤波器，以及与采样频率周围的一阶类型上采样滤波器大致相同的衰减。 致动器控制信号响应于控制样本的第二序列y i而被产生。

公开(公告)号：US09355667B1

公开(公告)日：2016-05-31

申请号：US14538610

申请日：2014-11-11

申请人： Western Digital Technologies, Inc.

发明人： Nathan J. Santee ,  Yanan Huang ,  Wei Xi ,  Hien T. Chu ,  Orhan Beker

IPC分类号： G11B5/596 ,  G11B21/02

CPC分类号： G11B5/59655 ,  G11B5/012 ,  G11B5/59627 ,  G11B5/59644 ,  G11B19/041 ,  G11B20/10527 ,  G11B20/1217 ,  G11B2020/1281

摘要： A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of tracks defined by servo sectors, wherein each servo sector comprises a plurality of servo bursts and the servo sectors define a plurality of servo wedges. A first write operation is executed to a first track and a first absolute position for the head is generated corresponding to a first servo wedge. A second write operation is executed to a second track and a second absolute position for the head is generated corresponding to the first servo wedge. An off-track write condition is detected when executing the second write operation based on the first absolute position and the second absolute position. The first absolute position comprises a track address of the first track and a position error measurement based on the servo bursts in the first servo wedge.

摘要翻译： 公开了一种数据存储装置，包括在包括由伺服扇区定义的多个轨道的盘上致动的头，其中每个伺服扇区包括多个伺服脉冲串，并且伺服扇区限定多个伺服楔形。 对第一轨道执行第一写入操作，并且对应于第一伺服楔形产生头部的第一绝对位置。 对第二轨道执行第二次写入操作，并且相应于第一伺服楔块产生头部的第二绝对位置。 当基于第一绝对位置和第二绝对位置执行第二写入操作时，检测到偏离写入条件。 第一绝对位置包括第一轨道的轨道地址和基于第一伺服楔中的伺服脉冲串的位置误差测量。

公开(公告)号：US09142225B1

公开(公告)日：2015-09-22

申请号：US14308373

申请日：2014-06-18

申请人： Western Digital Technologies, Inc.

发明人： Min Chen ,  Alexander Babinski ,  Yanan Huang ,  Young-Hoon Kim ,  Duc T. Phan ,  Jifang Tian

IPC分类号： G11B5/09 ,  G11B5/55

CPC分类号： G11B5/5539 ,  G11B5/483 ,  G11B5/556

摘要： An apparatus includes: a media; a head over the media; a primary-actuator coupled to the head; and control circuitry, coupled to the primary-actuator and a secondary-actuator, configured to limit a secondary-actuator slew rate.

摘要翻译： 一种装置包括：媒体; 媒体头 耦合到头部的主致动器; 以及耦合到初级致动器和辅助致动器的控制电路，其被配置为限制辅助致动器转换速率。

公开(公告)号：US08958169B1

公开(公告)日：2015-02-17

申请号：US14302088

申请日：2014-06-11

申请人： Western Digital Technologies, Inc.

发明人： Yanan Huang ,  Orhan Beker ,  Yiqian Li ,  Xiao Ma ,  Wenlin Zhang

IPC分类号： G11B21/02 ,  G11B5/55

CPC分类号： G11B5/5547

摘要： A data storage device is disclosed comprising a disk comprising a plurality of tracks defined by servo sectors, a head, and a servo controller configured to servo the head over the disk based on an estimated state generated by a state estimator. The servo controller is configured to execute a seek operation to seek the head over the disk and recover from a servo fault during the seek operation by generating an initial state estimate of the head at the beginning of the servo fault, and decelerating the head open-loop using a model-based deceleration control in response to the initial state estimate. While decelerating the head, the state estimator is re-qualified before the head reaches zero velocity, and after re-qualifying the state estimator and before the head reaches zero velocity, a seek operation is executed to seek the head to a target track closed-loop using the state estimator.

摘要翻译： 公开了一种数据存储装置，包括由伺服扇区，头部和伺服控制器定义的多个磁道的磁盘，所述磁头和伺服控制器被配置为基于由状态估计器产生的估计状态来将磁头伺服在磁盘上。 伺服控制器被配置为执行搜索操作以在寻道操作期间通过在伺服故障开始时产生头的初始状态估计而在磁盘上寻找磁头并从伺服故障恢复，并且使磁头开路减速， 循环使用基于模型的减速控制来响应初始状态估计。 当头部减速时，状态估计器在头部达到零速度之前被重新限定，并且在重新判定状态估计器之后并且在头部达到零速度之前，执行搜索操作以将头部寻找到目标轨道闭合 - 循环使用状态估计器。

公开(公告)号：US08929022B1

公开(公告)日：2015-01-06

申请号：US13720832

申请日：2012-12-19

申请人： Western Digital Technologies, Inc.

发明人： Yanan Huang ,  Shan Tang ,  Duc T. Phan ,  Chuanwen Ji ,  Alain Chahwan

IPC分类号： G11B5/596 ,  G11B21/02 ,  G11B5/55 ,  G11B27/36

CPC分类号： G11B5/5552 ,  G11B5/59627 ,  G11B19/048 ,  G11B20/18

摘要： A disk drive is disclosed comprising, a head, a disk surface, and a dual stage actuator (DSA) servo loop comprising a voice coil motor (VCM) servo loop comprising a VCM and a microactuator servo loop comprising a microactuator operable to actuate the head over the disk surface. A frequency component of a servo signal in the DSA servo loop is evaluated, wherein the frequency component is based on a peak frequency of an error rejection curve of the DSA servo loop. A degradation of the microactuator is detected based on the frequency component of the servo signal.

摘要翻译： 公开了一种磁盘驱动器，包括头，盘表面和双级致动器（DSA）伺服回路，其包括包括VCM的音圈电机（VCM）伺服回路和微致动器伺服回路，微循环器包括微型致动器，该微致动器可操作以致动头部 在磁盘表面上。 评估DSA伺服环路中的伺服信号的频率分量，其中，频率分量基于DSA伺服回路的误差抑制曲线的峰值频率。 基于伺服信号的频率分量检测微致动器的劣化。

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。