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1. 发明授权

US09286927B1 Data storage device demodulating servo burst by computing slope of intermediate integration points 有权
标题翻译：数据存储设备通过计算中间积分点的斜率来解调伺服脉冲串
公开(公告)号：US09286927B1
公开(公告)日：2016-03-15
申请号：US14571461
申请日：2014-12-16
申请人： Western Digital Technologies, Inc.
发明人： Shan Tang , Zhenyu Zhang , Chuanwen Ji , Duc T. Phan
IPC分类号： G11B5/596 , G11B20/00
CPC分类号： G11B5/59655 , G11B5/59688 , G11B20/00963 , G11B20/10009
摘要： A data storage device is disclosed comprising a head actuated over a disk surface comprising tracks defined by servo sectors, wherein each servo sector comprises at least one servo burst comprising a periodic pattern. The servo burst of one of the servo sectors is read to generate a read signal, and M intermediate integration points yNi are computed according to: y N i = ∑ k = 0 N i ⁢ r ⁡ ( k ⁢ ⁢ T s ) · sin ⁡ ( ω ⁢ ⁢ k ⁢ ⁢ T s ) ; i = 0 , 1 , … ⁢ , M - 1 where r(kTs) represents a sample point of the read signal, Ts represents a sample interval between the sample points, and ω represents a frequency of the periodic pattern in the servo burst.
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轨道的磁盘表面上致动的磁头，其中每个伺服扇区包括至少一个包括周期性模式的伺服脉冲串。读取伺服扇区之一的伺服脉冲以产生读取信号，并且根据以下公式计算M个中间积分点yNi：y N i =＆Sigma; k = 0 N i r＆CenterDot;（k，T s）·sin ⁡（ωTPSk？T s）; i = 0,1，...，M-1其中r（kTs）表示读取信号的采样点，Ts表示采样点之间的采样间隔，ω表示伺服脉冲串中周期性模式的频率。

2. 发明授权

US08929022B1 Disk drive detecting microactuator degradation by evaluating frequency component of servo signal 有权
标题翻译：通过评估伺服信号的频率分量，磁盘驱动器检测微致动器的劣化
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。

3. 发明授权

US08743503B1 Disk drive updating compensation values for multiple servo sectors based on PES generated for current servo sector 有权
标题翻译：基于为当前伺服扇区生成的PES，磁盘驱动器更新多个伺服扇区的补偿值
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。

4. 发明授权

US09099133B1 Disk drive servo control using hybrid upsample filter 有权
标题翻译：使用混合上采样滤波器的磁盘驱动器伺服控制
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。

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