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1. 发明授权

US09424871B1 Disk drive correcting an error in a detected gray code 有权
标题翻译：磁盘驱动器校正检测到的灰色代码中的错误
公开(公告)号：US09424871B1
公开(公告)日：2016-08-23
申请号：US14576063
申请日：2014-12-18
申请人： Western Digital Technologies, Inc.
发明人： Guoxiao Guo , Donald Brunnett , Jianguo Zhou , Wai Ee Wong
IPC分类号： G11B5/596 , G11B20/10
CPC分类号： G11B5/59655 , G11B5/59627 , G11B5/59644 , G11B20/10268 , G11B20/1403 , G11B20/18 , G11B2020/10916
摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks defined by a plurality of servo sectors. An estimated track ID is generated and a plurality of proximate track IDs is generated having values proximate the estimated track ID. A set of Gray codes is generated each corresponding to the estimated track ID and the proximate track IDs, wherein each Gray code in the set of Gray codes comprises N bits, and M bits out of a high order of the N bits comprise the same value. A recorded Gray code is detected in a first servo sector to generate a detected Gray code, and an error in the detected Gray code is corrected by inverting at least one bit in the detected Gray code comprising a value that is different from the value of the corresponding bit in the M bits.
摘要翻译：公开了一种磁盘驱动器，包括在包括由多个伺服扇区限定的多个磁道的盘上驱动的磁头。产生估计的轨道ID，并且生成具有接近估计轨道ID的值的多个邻近轨道ID。产生一组格雷码，每组格对应于估计的轨道ID和邻近轨道ID，其中格雷码组中的每个格雷码包括N比特，并且N比特的高阶中的M比特包含相同的值。在第一伺服扇区中检测到记录的格雷码，以产生检测到的格雷码，并且通过将检测到的格雷码中的至少一个比特反相来校正检测格雷码中的误差，该比特包括不同于 M位中的相应位。

2. 发明授权

US11087011B2 Data storage device with secure access based on tap inputs 有权
公开(公告)号：US11087011B2
公开(公告)日：2021-08-10
申请号：US15649553
申请日：2017-07-13
申请人： Western Digital Technologies, Inc.
发明人： Jun Xu , Lei Zhang , Wei Xi , Dean Mitcham Jenkins , David W. Chew , Jianguo Zhou
IPC分类号： G06F12/00 , G06F21/62 , H04L29/06 , G06F21/78 , G06F21/31 , G06F21/60 , G06F3/01 , G06F21/34
摘要： Systems and methods are disclosed for providing secure access to a data storage device. A user may provide tap inputs, such as taps or knocks, on an enclosure of the data storage device. The data storage device may determine whether the tap inputs are valid and may allow access to the data storage device (e.g., to non-volatile memory of the data storage device) when the tap inputs are valid.

3. 发明授权

US09142249B1 Disk drive using timing loop control signal for vibration compensation in servo loop 有权
标题翻译：磁盘驱动器使用定时回路控制信号进行伺服回路中的振动补偿
公开(公告)号：US09142249B1
公开(公告)日：2015-09-22
申请号：US14099886
申请日：2013-12-06
申请人： Western Digital Technologies, Inc.
发明人： Jianguo Zhou , Guoxiao Guo , Donald Brunnett , Min Chen , Wei Guo , Jie Yu
IPC分类号： G11B5/02 , G11B19/247 , G11B5/012 , G11B5/596 , G11B19/04
CPC分类号： G11B19/042 , G11B5/59622 , G11B5/59627 , G11B5/59694
摘要： A disk drive is disclosed comprising a timing loop configured to generate a clock synchronized to a rotation of a disk and a servo loop configured to control an actuator to actuate a head over the disk. A timing signal generated by the timing loop is filtered with a pre-compensation filter (PCF) comprising an inverse transfer function from a delta in a rotation velocity of the disk (Δω) due to a vibration affecting the disk drive to the timing signal, and the actuator is controlled to actuate the head over the disk based on an output of the PCF.
摘要翻译：公开了一种磁盘驱动器，其包括定时回路，其被配置为产生与盘的旋转同步的时钟和被配置为控制致动器来驱动盘上的磁头的伺服回路。由定时环产生的定时信号由于影响磁盘驱动器的振动到定时的滤波器（＆Dgr;ω），由包括逆传递函数的预补偿滤波器（PCF）进行滤波信号，并且致动器被控制以基于PCF的输出来驱动磁头上的磁头。

4. 发明授权

US09058826B1 Data storage device detecting free fall condition from disk speed variations 有权
标题翻译：数据存储装置从磁盘速度变化检测自由落体状态
公开(公告)号：US09058826B1
公开(公告)日：2015-06-16
申请号：US14194059
申请日：2014-02-28
申请人： Western Digital Technologies, Inc.
发明人： Wei Guo , Jianguo Zhou , Yiming Chen , Guoxiao Guo , Jie Yu
IPC分类号： G11B21/02 , G11B5/55 , G11B20/14
CPC分类号： G11B19/043 , G11B20/18 , G11B21/12
摘要： A data storage device is disclosed comprising a disk comprising data, and a head actuated over the disk. A timing signal is generated by reading the data from the disk, and a frequency generator is adjusted based on the timing signal to generate a disk locked clock substantially synchronized to a rotation speed of the disk. A free fall condition is detected based on the timing signal, and when the free fall condition is detected the head is parked.
摘要翻译：公开了一种数据存储装置，其包括包含数据的磁盘和在磁盘上启动的磁头。通过从盘读取数据来产生定时信号，并且基于定时信号调整频率发生器，以产生基本上与盘的转速同步的盘锁定时钟。基于定时信号检测到自由落体状态，并且当检测到自由落体状态时，头被停放。

5. 发明授权

US10410657B1 Data storage device employing nominal and adaptive multi-actuator decoupler 有权
公开(公告)号：US10410657B1
公开(公告)日：2019-09-10
申请号：US16252593
申请日：2019-01-19
申请人： Western Digital Technologies, Inc.
发明人： Jianguo Zhou , Masahito Kobayashi , Tetsuo Semba , Feng Hong , Hidehiko Numasato
IPC分类号： G11B5/54 , G11B5/012 , G11B21/10
摘要： A data storage device is disclosed comprising a first actuator configured to actuate a first head over a first disk surface, and a second actuator configured to actuate a second head over a second disk surface. A seeking control signal is generated and used to control the first actuator to seek the first head over the first disk surface. The seeking control signal is filtered with a decoupler to generate a decoupler control signal, wherein the decoupler comprises a nominal decoupler and an adaptive decoupler. A tracking control signal is generated based on the decoupler control signal, and the tracking control signal is used to control the second actuator in order to access the second disk surface using the second head.

6. 发明授权

US09058827B1 Disk drive optimizing filters based on sensor signal and disturbance signal for adaptive feed-forward compensation 有权
标题翻译：基于传感器信号和干扰信号的磁盘驱动器优化滤波器进行自适应前馈补偿
公开(公告)号：US09058827B1
公开(公告)日：2015-06-16
申请号：US13927096
申请日：2013-06-25
申请人： Western Digital Technologies, Inc.
发明人： Kuang-Yang Tu , Wei Xi , Jianguo Zhou , Teddy T. Chen
IPC分类号： G11B5/596 , G11B5/58
CPC分类号： G11B5/59694
摘要： A disk drive is disclosed comprising a servo control system operable to actuate a head over a disk. A sensor signal is filtered with a first filter comprising a frequency response, and the filtered sensor signal is filtered to generate a compensated sensor signal. An error signal is filtered with a second filter comprising the frequency response, and an adaptation control signal is generated based on the compensated sensor signal and the filtered error signal. An adaptive filter is adapted in response to the adaptation control signal, wherein the adaptive filter filters the sensor signal to generate feed-forward compensation values. The feed-forward compensation values are applied to the servo control system to compensate for the disturbance. A disturbance signal that represents the disturbance is generated, and the frequency response of the first and second filters is optimized based on the sensor signal and the disturbance signal.
摘要翻译：公开了一种磁盘驱动器，其包括可操作以在盘上致动磁头的伺服控制系统。用包括频率响应的第一滤波器对传感器信号进行滤波，并且滤波的传感器信号被滤波以产生经补偿的传感器信号。用包括频率响应的第二滤波器对误差信号进行滤波，并且基于经补偿的传感器信号和滤波的误差信号产生自适应控制信号。自适应滤波器适应于自适应控制信号，其中自适应滤波器对传感器信号进行滤波以产生前馈补偿值。前馈补偿值被应用于伺服控制系统以补偿干扰。产生表示干扰的干扰信号，并且基于传感器信号和干扰信号来优化第一和第二滤波器的频率响应。

7. 发明授权

US08953278B1 Disk drive selecting disturbance signal for feed-forward compensation 有权
标题翻译：磁盘驱动器选择用于前馈补偿的干扰信号
公开(公告)号：US08953278B1
公开(公告)日：2015-02-10
申请号：US14253797
申请日：2014-04-15
申请人： Western Digital Technologies, Inc.
发明人： Jianguo Zhou , Wei Xi , Kuang-Yang Tu , Alain Chahwan
IPC分类号： G11B5/596
CPC分类号： G11B5/59694
摘要： A disk drive is disclosed comprising a disk, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk. A plurality of disturbance signals is generated in response to a vibration. A plurality of correlations is generated in response to each disturbance signal and an error signal of the servo control system. At least one of the disturbance signals is selected in response to the correlations. A feed-forward compensation value is generated in response to the selected disturbance signal, and the feed-forward compensation value is applied to the servo control system to compensate for the vibration.
摘要翻译：公开了一种磁盘驱动器，其包括磁盘，磁头和控制电路，其包括可操作以在磁盘上致动磁头的伺服控制系统。响应于振动产生多个干扰信号。响应于每个干扰信号和伺服控制系统的误差信号产生多个相关。响应于相关性来选择至少一个干扰信号。响应于所选择的干扰信号产生前馈补偿值，并且将前馈补偿值应用于伺服控制系统以补偿振动。

8. 发明授权

US11288353B2 Data storage device with secure access based on motions of the data storage device 有权
公开(公告)号：US11288353B2
公开(公告)日：2022-03-29
申请号：US15649562
申请日：2017-07-13
申请人： Western Digital Technologies, Inc.
发明人： Jun Xu , Lei Zhang , Wei Xi , Dean Mitcham Jenkins , David W. Chew , Jianguo Zhou
IPC分类号： G06F12/00 , G06F21/36 , G06F3/06 , G06F21/31
摘要： Systems and methods are disclosed for providing secure access to a data storage device. A user may move the data storage device (e.g., wave, twist, etc.). The data storage device may determine whether the motions valid and may allow access to the data storage device (e.g., to non-volatile memory of the data storage device) when the motions are valid.

9. 发明授权

US09026728B1 Disk drive applying feed-forward compensation when writing consecutive data tracks 有权
标题翻译：写入连续数据磁道时，磁盘驱动器应用前馈补偿
公开(公告)号：US09026728B1
公开(公告)日：2015-05-05
申请号：US13911365
申请日：2013-06-06
申请人： Western Digital Technologies, Inc.
发明人： Wei Xi , Jianguo Zhou
IPC分类号： G06F13/00 , G11B21/10
CPC分类号： G11B5/59688 , G11B5/59627 , G11B5/59655
摘要： A disk drive is disclosed comprising a disk comprising a plurality of servo tracks defined by servo sectors, a head actuated over the disk, and control circuitry comprising a servo control system operable to servo the head over the disk. A plurality of data tracks are defined relative to the servo tracks, and a first data track is accessed while servoing the head over the first data track based on a position error signal Xn−1(k) generated at each servo sector of the first data track. Feed-forward compensation values are generated based on Xn−1(k), and a second, consecutive data track is accessed while servoing the head over the second data track based on a position error signal Xn(k) generated at each servo sector of the second data track and based on the feed-forward compensation values.
摘要翻译：公开了一种磁盘驱动器，其包括盘，该盘包括由伺服扇区限定的多个伺服轨道，在盘上致动的磁头，以及控制电路，其包括可操作以通过磁盘伺服磁头的伺服控制系统。基于在第一数据的每个伺服扇区处产生的位置误差信号Xn-1（k），在第一数据磁道上伺服磁头的同时访问多个数据磁道，并且访问第一数据磁道跟踪。基于Xn-1（k）产生前馈补偿值，并且基于在每个伺服扇区处产生的位置误差信号Xn（k），在第二数据轨道上伺服头部时访问第二连续数据轨道第二个数据轨道并基于前馈补偿值。

10. 发明授权

US08970982B1 Disk drive compensating for non-linearity of a head based on a fly height of the head 有权
标题翻译：磁盘驱动器基于磁头的飞行高度补偿磁头的非线性
公开(公告)号：US08970982B1
公开(公告)日：2015-03-03
申请号：US14100646
申请日：2013-12-09
申请人： Western Digital Technologies, Inc.
发明人： Jianguo Zhou , Abhishek Dhanda , Eugene C. Wu , Teddy T. Chen , Sanghoon Chu , Guoxiao Guo , Jie Yu
IPC分类号： G11B21/02 , G11B21/12
CPC分类号： G11B5/5547 , G11B5/6029 , G11B5/607
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. A position of the head is measured based on the servo sectors, and a compensated position of the head is generated based on the measured position of the head and a fly height of the head. The head is actuated over the disk based on the compensated position of the head.
摘要翻译：公开了一种磁盘驱动器，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。基于伺服扇区测量头的位置，并且基于测量的头部位置和头部的飞行高度来产生头部的补偿位置。基于头的补偿位置，头部被驱动到盘上。

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