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1. 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。

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

US09013825B1 Electronic system with vibration management mechanism and method of operation thereof 有权
标题翻译：具有振动管理机构的电子系统及其操作方法
公开(公告)号：US09013825B1
公开(公告)日：2015-04-21
申请号：US14310944
申请日：2014-06-20
申请人： Western Digital Technologies, Inc.
发明人： Alain Chahwan
IPC分类号： G11B21/02 , G11B5/58 , G11B5/012
CPC分类号： G11B5/59694 , G11B5/5534 , G11B5/5582
摘要： An apparatus includes: a media; a head assembly over the media; a head actuation motor coupled to the head assembly; control circuitry, coupled to the head actuation motor, configured to position the head assembly; and a microphone, coupled to the control circuitry, configured to generate a signal in response to a vibration; and wherein: the control circuitry is further configured to: generate a compensation value based on the signal; and control the head actuator motor based on the compensation value.
摘要翻译：一种装置包括：媒体; 媒体上的头部组件; 耦合到头组件的头致动马达; 耦合到头致动马达的控制电路，被配置为定位头部组件; 以及耦合到所述控制电路的麦克风，被配置为响应于振动而产生信号; 并且其中：所述控制电路还被配置为：基于所述信号产生补偿值; 并根据补偿值控制头致动器马达。

4. 发明授权

US08947819B1 Disk drive implementing hysteresis for primary shock detector based on a more sensitive secondary shock detector 有权
标题翻译：基于更敏感的次级冲击检测器的主要震动检测器的磁盘驱动器实现滞后
公开(公告)号：US08947819B1
公开(公告)日：2015-02-03
申请号：US14054738
申请日：2013-10-15
申请人： Western Digital Technologies, Inc.
发明人： Timothy A. Ferris , Alain Chahwan
IPC分类号： G11B27/36 , G11B15/04 , G11B19/04
CPC分类号： G11B19/042 , G11B5/5582 , G11B5/59694
摘要： A disk drive is disclosed comprising a head actuated over a disk, and control circuitry comprising a first shock detector and a second shock detector. A first number of shock events is detected based on the first shock detector, and when the first number of shock events exceeds an upper event threshold, a sensitivity of the first shock detector is decreased. After decreasing the sensitivity of the first shock detector, a second number of shock events is detected based on the second shock detector operating at a higher sensitivity than the first shock detector. When the second number of shock events falls below a lower event threshold, the sensitivity of the first shock detector is increased.
摘要翻译：公开了一种磁盘驱动器，包括在磁盘上致动的磁头，以及包括第一冲击检测器和第二冲击检测器的控制电路。基于第一震动检测器检测到第一数量的冲击事件，并且当第一数量的冲击事件超过上事件阈值时，第一冲击检测器的灵敏度降低。在降低第一震动检测器的灵敏度之后，基于以比第一震动检测器更高的灵敏度操作的第二震动检测器来检测第二数量的冲击事件。当第二数量的冲击事件下降到较低事件阈值以下时，第一震动检测器的灵敏度增加。

5. 发明授权

US08922931B1 Disk drive releasing variable amount of buffered write data based on sliding window of predicted servo quality 有权
标题翻译：基于预测伺服质量的滑动窗口，磁盘驱动器释放缓冲写入数据的可变量
公开(公告)号：US08922931B1
公开(公告)日：2014-12-30
申请号：US13928329
申请日：2013-06-26
申请人： Western Digital Technologies, Inc.
发明人： Chuanwen Ji , Alain Chahwan , Orhan Beker , Yanan Huang , Duc T. Phan
IPC分类号： G11B19/04 , G11B5/596
CPC分类号： G11B19/044 , G11B5/59694 , G11B19/041 , G11B19/042 , G11B19/045
摘要： A disk drive is disclosed wherein N data wedges of write data are buffered in a buffer. After writing at least two of the data wedges to the disk including a first data wedge and a second data wedge, a first servo metric value is measured when reading a first servo sector, and a second servo metric value is predicted based on the first servo metric value, wherein the second servo metric value corresponds to a second servo sector following the first servo sector. When the first servo metric value indicates a safe write condition and the second servo metric value indicates an unsafe write condition, the first data wedge is released from the buffer, and when the first servo metric value indicates a safe write condition and the second servo metric value indicates a safe write condition, the first and second data wedges are released from the buffer.
摘要翻译：公开了一种磁盘驱动器，其中写入数据的N个数据楔被缓冲在缓冲器中。在将包括第一数据楔和第二数据楔的数据楔中的至少两个数据写入之后，在读取第一伺服扇区时测量第一伺服度量值，并且基于第一伺服扇区预测第二伺服度量值度量值，其中所述第二伺服度量值对应于所述第一伺服扇区之后的第二伺服扇区。当第一伺服度量值指示安全写入条件并且第二伺服度量值指示不安全写入条件时，第一数据楔从缓冲器释放，并且当第一伺服度量值指示安全写入条件并且第二伺服度量值表示安全写入条件，第一和第二数据楔从缓冲器中释放。

6. 发明授权

US09401165B1 Method and system to monitor magnetic head loading and unloading stability for a data storage system 有权
标题翻译：监控数据存储系统磁头加载和卸载稳定性的方法和系统
公开(公告)号：US09401165B1
公开(公告)日：2016-07-26
申请号：US14303955
申请日：2014-06-13
申请人： Western Digital Technologies, Inc.
发明人： Jifang Tian , Alain Chahwan
IPC分类号： G11B27/36 , G11B21/02 , G11B5/55
CPC分类号： G11B5/5582 , G11B5/54
摘要： A method and system to monitor stability of magnetic head loading and unloading beside media for a data storage system is described. A shock sensor is utilized to detect shock during preloading of a magnetic head beside recording media, during loading of a magnetic head beside recording media, during pre-unloading of a magnetic head from the recording media, and/or during unloading of a magnetic head from the recording media. In an aspect, a desired pitch static attitude (PSA) and roll static attitude (RSA) of a slider is determined. In an aspect, the stability of a magnetic head is assessed and screened while on the fly and during head gimbal assembly (HGA) design and testing to improve overall data storage device reliability.
摘要翻译：描述了一种用于监测数据存储系统的介质旁边的磁头加载和卸载的稳定性的方法和系统。在将磁头从记录介质预先卸载期间和/或在磁头卸载期间，使用冲击传感器来在记录介质旁边的磁头预加载期间，在记录介质旁边的磁头加载期间检测冲击从录音媒体。在一方面，确定滑块的期望的俯仰静止姿态（PSA）和滚动静态姿态（RSA）。在一方面，磁头的稳定性在飞行和头部万向节组装（HGA）设计和测试期间进行评估和筛选，以提高整体数据存储设备的可靠性。

7. 发明授权

US09053724B1 Disk drive actuating first head microactuator while sensing signal from second head microactuator 有权
标题翻译：磁盘驱动器致动第一头微型致动器，同时感测来自第二头微型致动器的信号
公开(公告)号：US09053724B1
公开(公告)日：2015-06-09
申请号：US14023776
申请日：2013-09-11
申请人： Western Digital Technologies, Inc.
发明人： Alain Chahwan , Mingji Lou
IPC分类号： G11B5/55
CPC分类号： G11B5/5547 , G11B5/483 , G11B5/5552 , G11B5/5556 , G11B5/5582 , G11B5/59694 , G11B19/042
摘要： A disk drive is disclosed comprising a first disk surface and a second disk surface, a first head operable to be positioned over the first disk surface, a second head operable to be positioned over the second disk surface, a first microactuator operable to actuate the first head, and a second microactuator operable to actuate the second head. The first head is actuated over the first disk surface using the first microactuator while processing a second sensor signal generated by the second microactuator, and the second head is actuated over the second disk surface using the second microactuator while processing a first sensor signal generated by the first microactuator.
摘要翻译：公开了一种磁盘驱动器，包括第一磁盘表面和第二磁盘表面，可操作以定位在第一磁盘表面上的第一磁头，可操作以定位在第二磁盘表面上的第二磁头，可操作以致动第一磁盘表面的第一磁盘表面头部和可操作以致动第二头部的第二微致动器。在处理由第二微致动器产生的第二传感器信号的同时，使用第一微致动器在第一盘表面上致动第一磁头，并且使用第二微致动器在第二磁盘表面上致动第二磁头，同时处理由第二微致动器产生的第一传感器信号第一台微型致动器

8. 发明授权

US08913338B1 Disk drive reducing write unsafe threshold when detecting an unrecoverable servo compensation value 有权
标题翻译：当检测到不可恢复的伺服补偿值时，磁盘驱动器减少写入不安全阈值
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。

9. 发明授权

US10748568B1 Data storage device employing dynamic track trajectories 有权
公开(公告)号：US10748568B1
公开(公告)日：2020-08-18
申请号：US16532717
申请日：2019-08-06
申请人： Western Digital Technologies, Inc.
发明人： Alain Chahwan , Niranjay Ravindran
IPC分类号： G11B5/56 , G11B5/55 , G11B21/12 , G11B20/10 , G11B5/58
摘要： A data storage device is disclosed comprising a head actuated over a disk comprising servo data for defining a plurality of data tracks, including consecutive data tracks N−1, N, and N+1. Data is written to data track N using a position error signal (PES) generated by reading the servo data, and a read track trajectory for data track N is generated based on the PES of the write. Data is read from data track N based on the read track trajectory for data track N.

10. 发明授权

US10748567B1 Data storage device aborting write operation based on accumulated track squeeze metric for adjacent data track 有权
公开(公告)号：US10748567B1
公开(公告)日：2020-08-18
申请号：US16655630
申请日：2019-10-17
申请人： Western Digital Technologies, Inc.
发明人： Hideki Zaitsu , Niranjay Ravindran , So Ogiwara , Toshihisa Komai , Alain Chahwan , Weldon M. Hanson
IPC分类号： G11B5/09 , G11B5/55 , G11B27/36 , G11B20/10
摘要： A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of data tracks, including consecutive data tracks N−1 and N. A first write to data track N is performed using a first position error signal (PES) representing a position of the head relative to the data tracks. A track squeeze metric is generated for data track N−1 based on at least the first PES of the first write. The track squeeze metric for data track N−1 is accumulated during the first write, and the first write is aborted when the accumulated track squeeze metric for data track N−1 exceeds a first threshold.

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