公开(公告)号：US11456014B1

公开(公告)日：2022-09-27

申请号：US17494825

申请日：2021-10-05

申请人： Western Digital Technologies, Inc.

发明人： Zaifeng Chen ,  Chuanwen Ji

IPC分类号： G11B5/596 ,  G11B20/10

摘要： Generating a hard disk drive (HDD) data track repeatable runout (RRO) compensation value for a target track involves querying at least one RRO table for a closest track to the target track external servo target (EST) and identifying an ESTx corresponding to the closest track, computing a first absolute value of the difference between the EST and the ESTx, and responsive to the first absolute value being less than an approximation threshold, setting the RRO compensation value for the target track to the RRO compensation value for the closest track. Else, querying the RRO table(s) for each adjacent track to the target track, computing the difference between the ESTs for the adjacent tracks, and responsive to the second absolute value being less than an interpolation threshold, determining an RRO compensation value for the target track based on RRO compensation values corresponding to the adjacent tracks.

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：US11790949B2

公开(公告)日：2023-10-17

申请号：US17685184

申请日：2022-03-02

申请人： Western Digital Technologies, Inc.

发明人： Jim French ,  Austin Striegel ,  Gary Herbst ,  Chuanwen Ji

IPC分类号： G11B20/18 ,  G11B27/36 ,  G11B21/10

CPC分类号： G11B21/106

摘要： A data storage device comprises a disk having a plurality of data tracks and a plurality of servo wedges wherein the plurality of servo wedges comprise a plurality of wedge repeatable runout (WRRO) fields configured to store a plurality of WRRO compensation values in connection with the plurality of data tracks. The data storage device may also include a read/write head configured to be actuated over the disk, and a controller configured to gather position error signal (PES) data needed for computation of the WRRO compensation values during a field operation of the data storage device. The data storage device may be further configured to adjust a position of the read/write head based on the WRRO compensation values.

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。

公开(公告)号：US11482253B1

公开(公告)日：2022-10-25

申请号：US17506660

申请日：2021-10-20

申请人： Western Digital Technologies, Inc.

发明人： Zaifeng Chen ,  Chuanwen Ji

IPC分类号： G11B20/20 ,  G11B20/10 ,  G11B5/012

摘要： Processing hard disk drive (HDD) data track repeatable runout (RRO) compensation data includes, for each read-write head constituent to the HDD, and for each data track on which the read-write head operates, saving RRO compensation data to single-level cell (SLC) area of a NAND memory component, and finalizing the RRO data before processing the next read-write head of the HDD, thereby minimizing the SLC area used. Finalizing the RRO data may include sorting the RRO data for the read-write head in the SLC area, moving the sorted RRO data from the SLC area to triple-level cell (TLC) or other higher-level cell area of the NAND, and then erasing the RRO data from the SLC area to free up that memory space, thereby reducing the risk of wearing out the TLC area.

公开(公告)号：US20230282237A1

公开(公告)日：2023-09-07

申请号：US17685184

申请日：2022-03-02

申请人： Western Digital Technologies, Inc.

发明人： Jim French ,  Austin Striegel ,  Gary Herbst ,  Chuanwen Ji

IPC分类号： G11B21/10

CPC分类号： G11B21/106

摘要： A data storage device comprises a disk having a plurality of data tracks and a plurality of servo wedges wherein the plurality of servo wedges comprise a plurality of wedge repeatable runout (WRRO) fields configured to store a plurality of WRRO compensation values in connection with the plurality of data tracks. The data storage device may also include a read/write head configured to be actuated over the disk, and a controller configured to gather position error signal (PES) data needed for computation of the WRRO compensation values during a field operation of the data storage device. The data storage device may be further configured to adjust a position of the read/write head based on the WRRO compensation values.

公开(公告)号：US09349401B1

公开(公告)日：2016-05-24

申请号：US14526710

申请日：2014-10-29

申请人： Western Digital Technologies, Inc.

发明人： Alexander Babinski ,  Zhenyu Zhang ,  Eugene Chun-Tsing Wu ,  Alan M. Fossen ,  Chuanwen Ji ,  Duc T. Phan ,  Donald Brunnett

IPC分类号： G11B5/60

CPC分类号： G11B5/6076 ,  G11B5/6029 ,  G11B20/1889

摘要： An apparatus includes: a media; a head over the media; a read channel, coupled to the head, configured to extract data from the media; control circuitry, coupled to the read channel, configured to execute a read command; and wherein the read channel is further configured to: generate, based on extracting the data from the media, a data condition indicator, and provide, for use by the control circuitry, the data and the data condition indicator.

摘要翻译： 一种装置包括：媒体; 媒体头 耦合到头部的读通道，被配置为从媒体提取数据; 耦合到读通道的控制电路，被配置为执行读命令; 并且其中所述读通道还被配置为：基于从所述介质提取所述数据来生成数据条件指示符，并且为所述控制电路提供所述数据和所述数据条件指示符。

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。