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1. 发明授权

US07212374B1 Disk drive to characterize misaligned servo wedges 有权
标题翻译：磁盘驱动器来表征不对准的伺服楔
公开(公告)号：US07212374B1
公开(公告)日：2007-05-01
申请号：US11250649
申请日：2005-10-14
申请人： Zhi Wang , Jenghung Chen , Chun Sei Tsai , Carl E. Barlow
发明人： Zhi Wang , Jenghung Chen , Chun Sei Tsai , Carl E. Barlow
IPC分类号： G11B5/596 , G11B21/02
CPC分类号： G11B5/59627 , G11B5/5534
摘要： Disclosed is a disk drive to characterize misaligned servo wedges. A disk of the disk drive includes a plurality of circumferential tracks, in which, each track includes a plurality of servo wedges spaced sequentially around the circumference of the track wherein the servo wedges may be misaligned relative to the head of the disk drive that moves about a pivot. A servo controller is used to characterize the misaligned servo wedges relative to the head during a seek operation by implementing the following operations: commanding the head to perform a seek operation from a starting track to an ending track; obtaining samples of wedge-to-wedge time (WTWT) values corresponding to time intervals between identified servo wedges for sampled tracks traversed during the seek operation; calculating WTWT variations for each sample; and calculating a calibrated misalignment value for each sample based upon WTWT variations.
摘要翻译：公开了一种用于表征不对准伺服楔的磁盘驱动器。磁盘驱动器的盘包括多个周向轨道，其中，每个轨道包括围绕轨道圆周顺序间隔的多个伺服楔，其中伺服楔可能相对于磁盘驱动器的头部移动而围绕一个枢纽伺服控制器用于通过执行以下操作来表征在搜索操作期间相对于头部的不对准伺服楔块：命令头从起始轨到结束轨执行寻道操作; 获得对应于在寻道操作期间穿过的采样轨迹的识别的伺服楔之间的时间间隔的楔到楔时间（WTWT）值的样本; 计算每个样品的WTWT变化; 以及基于WTWT变化计算每个样本的校准的未对准值。

2. 发明授权

US07209310B1 Disk drive identifying starting track by performing multiple load operations 有权
标题翻译：通过执行多个加载操作来识别启动轨的磁盘驱动器
公开(公告)号：US07209310B1
公开(公告)日：2007-04-24
申请号：US11188947
申请日：2005-07-25
申请人： Chun Sei Tsai , Ngoc Le , Jenghung Chen , Hien Chu
发明人： Chun Sei Tsai , Ngoc Le , Jenghung Chen , Hien Chu
IPC分类号： G11B21/02
CPC分类号： G11B5/59633
摘要： A disk drive is disclosed comprising a disk having a plurality of servo sectors defining a plurality of servo tracks, wherein each servo sector comprises a track address identifying a corresponding servo track. A head is actuated over the disk, and a ramp is positioned near an outer diameter of the disk, wherein an edge of the ramp extends over a plurality of the servo tracks. The head is loaded from the ramp onto the disk, and a track address in at least one of the servo sectors is detected and stored. The process is repeated a number of times, and then a starting track proximate an outer diameter of the disk is identified in response to the detected and stored track addresses.
摘要翻译：公开了一种磁盘驱动器，其包括具有限定多个伺服磁道的多个伺服扇区的磁盘，其中每个伺服扇区包括标识对应的伺服磁道的磁道地址。头部被驱动在盘上，并且斜面位于盘的外径附近，其中斜坡的边缘在多个伺服轨道上延伸。头部从斜坡加载到盘上，并且检测并存储至少一个伺服扇区中的轨道地址。该过程重复多次，然后响应于检测和存储的轨道地址识别靠近盘的外径的起始轨迹。

3. 发明授权

US07551390B1 Disk drive to characterize misaligned servo wedges 失效
标题翻译：磁盘驱动器来表征不对准的伺服楔
公开(公告)号：US07551390B1
公开(公告)日：2009-06-23
申请号：US11842315
申请日：2007-08-21
申请人： Zhi Wang , Jenghung Chen
发明人： Zhi Wang , Jenghung Chen
IPC分类号： G11B5/596 , G11B5/09
CPC分类号： G11B5/59611 , G11B19/045 , G11B20/10009 , G11B20/10222 , G11B20/1403 , G11B20/18 , G11B2020/1282 , G11B2220/2516
摘要： Disclosed is a disk drive and method to characterize misaligned servo wedges. The disk drive includes an actuator arm, a head, a disk, and a servo controller. The head is connected to a distal end of the actuator arm in which the actuator arm is rotatable about a pivot to move the head radially over the disk. The servo controller is used to characterize misaligned servo wedges by implementing operations including: commanding the head to track follow on a track; measuring wedge-to-wedge time (WTWT) values corresponding to time intervals between identified servo wedges; calculating wedge-to-wedge time (WTWT) variations for the measured WTWT values; and characterizing the calculated WTWT variations, wherein, characterizing the calculated WTWT variations for the track includes utilizing a WTWT variation modeling function to model the WTWT variations.
摘要翻译：公开了一种用于表征不对准伺服楔的磁盘驱动器和方法。磁盘驱动器包括致动器臂，磁头，磁盘和伺服控制器。头部连接到致动器臂的远端，致动器臂可绕枢轴旋转，以使头部径向移动到盘上。伺服控制器用于通过执行操作来表征不对准的伺服楔块，包括：命令头跟踪轨道跟踪; 测量对应于所识别的伺服楔之间的时间间隔的楔到楔时间（WTWT）值; 计算测量WTWT值的楔形到楔形时间（WTWT）变化; 并且表征所计算的WTWT变化，其中，表征所述轨道的所计算的WTWT变化包括利用WTWT变化建模函数来模拟所述WTWT变化。

4. 发明授权

US06972540B1 Disk drive employing wedge spindle speed control with eccentricity compensation 失效
标题翻译：磁盘驱动器采用楔形主轴速度控制与偏心补偿
公开(公告)号：US06972540B1
公开(公告)日：2005-12-06
申请号：US10993077
申请日：2004-11-19
申请人： Zhi Wang , Jenghung Chen , David Dung Tien Nguyen
发明人： Zhi Wang , Jenghung Chen , David Dung Tien Nguyen
IPC分类号： G11B5/596 , G11B19/28 , G11B21/02 , H02P5/00
CPC分类号： G11B19/28 , G11B5/5534 , G11B5/59627
摘要： A disk drive is disclosed wherein a BEMF speed error is measured during a BEMF spindle speed control mode, and a spindle control current is updated in response to the BEMF speed error to drive the disk at an operating speed. A reference time period (RTP) is calibrated, and a sinusoidal error in a wedge time period (WTP) due to eccentricity in the disk rotating is estimated to generate an eccentricity compensation value. After switching to a wedge spindle speed control mode, an actual WTP is detected and a wedge speed error is generated in response to the RTP, the detected actual WTP, and the eccentricity compensation value. The disk is then maintained at the operating speed by updating the spindle control current in response to the wedge speed error.
摘要翻译：公开了一种磁盘驱动器，其中在BEMF主轴速度控制模式期间测量BEMF速度误差，并且响应于BEMF速度误差来更新主轴控制电流以以操作速度驱动盘。校准参考时间段（RTP），并且估计由于盘旋转中的偏心引起的楔形时间段（WTP）中的正弦误差产生偏心补偿值。切换到楔形主轴速度控制模式后，检测到实际的WTP，并响应于RTP，检测到的实际WTP和偏心补偿值产生楔速度误差。然后通过根据楔形速度误差更新主轴控制电流来将盘维持在运行速度。

5. 发明授权

US07251098B1 Disk drive adjusting write clock frequency to compensate for eccentricity in disk rotation 有权
标题翻译：磁盘驱动器调整写入时钟频率以补偿磁盘旋转中的偏心率
公开(公告)号：US07251098B1
公开(公告)日：2007-07-31
申请号：US10992930
申请日：2004-11-19
申请人： Zhi Wang , Jenghung Chen , David Dung Tien Nguyen
发明人： Zhi Wang , Jenghung Chen , David Dung Tien Nguyen
IPC分类号： G11B5/596 , G11B5/09
CPC分类号： G11B5/09 , G11B5/59627 , G11B20/10055 , G11B20/10296 , G11B20/14
摘要： A disk drive is disclosed that estimates a sinusoidal error in a wedge time period due to eccentricity in the disk rotating to generate eccentricity compensation values. During a write operation a head is positioned over a target data sector within a target track, a write clock frequency is set using an eccentricity compensation value corresponding to the target data sector, and data is written to the target data sector using the write clock frequency. In this manner, the eccentricity compensation value adjusts the write clock frequency to better optimize the linear bit density from the inner to outer diameter tracks.
摘要翻译：公开了一种磁盘驱动器，其估计由于盘旋转中的偏心度而产生偏心补偿值的楔形时间段内的正弦误差。在写入操作期间，磁头位于目标轨道内的目标数据扇区上方，使用对应于目标数据扇区的偏心补偿值来设置写时钟频率，并且使用写时钟频率将数据写入目标数据扇区。以这种方式，偏心补偿值调整写入时钟频率以更好地优化从内到外径轨道的线性位密度。

6. 发明授权

US07088547B1 Disk drive recursively estimating repeatable runout 有权
标题翻译：磁盘驱动器递归地估计可重复的跳动
公开(公告)号：US07088547B1
公开(公告)日：2006-08-08
申请号：US11188914
申请日：2005-07-25
申请人： Zhi Wang , Jenghung Chen
发明人： Zhi Wang , Jenghung Chen
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： A disk drive is disclosed comprising control circuitry for generating a control signal applied to a VCM in response to a position error signal (PES) generated from reading embedded servo sectors and a feed-forward compensation value that compensates for a repeatable runout (RRO) disturbance. The feed-forward compensation value is generated for each servo sector in response to an RRO estimate Ŝ computed recursively for each servo sector according to: S ^ n + 1 = S ^ n - λ ⁡ [ S ^ n - 1 n ⁢ ∑ i = 1 n ⁢ ⁢ PES i ] wherein: λ is a predetermined fraction; PESi is the position error signal generated for a selected servo sector during an ith revolution of the disk; and n represents a number of disk revolutions.
摘要翻译：公开了一种磁盘驱动器，其包括用于响应于从读取嵌入式伺服扇区产生的位置误差信号（PES）产生施加到VCM的控制信号的控制电路和补偿可重复跳动（RRO）干扰的前馈补偿值。响应于针对每个伺服扇区递归地计算的RRO估计S，针对每个伺服扇区产生前馈补偿值：

7. 发明授权

US08643976B1 Method for improved repeatable runout learning in a disk drive 失效
标题翻译：在磁盘驱动器中改进可重复跳动学习的方法
公开(公告)号：US08643976B1
公开(公告)日：2014-02-04
申请号：US11700380
申请日：2007-01-31
申请人： Zhi Wang , Hien T. Chu , Jenghung Chen
发明人： Zhi Wang , Hien T. Chu , Jenghung Chen
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： A method is disclosed for adaptive learning of fundamental-frequency repeatable runout (1FRRO) compensation information in a disk drive. The disk drive includes a transducer head, a magnetic disk having a plurality of concentric data tracks defined by embedded servo wedges that provide position information, and a control system. In the method, 1FRRO compensation information is learned over a predetermined minimum number of disk revolutions. After the predetermined minimum number of disk revolutions, the 1FRRO compensation information is monitored for convergence while learning of the 1FRRO compensation information continues. Learning is terminated upon detection of convergence of the 1FRRO compensation information.
摘要翻译：公开了一种用于磁盘驱动器中基频可重复跳动（1FRRO）补偿信息的自适应学习的方法。磁盘驱动器包括换能器头，具有由提供位置信息的嵌入式伺服楔定义的多个同心数据磁道的磁盘以及控制系统。在该方法中，在预定的最小盘数转换中学习1FRRO补偿信息。在预定的最小盘数之后，在继续学习1FRRO补偿信息的同时监视1FRRO补偿信息的收敛。在检测到1FRRO补偿信息的收敛时，学习被终止。

8. 发明授权

US07068451B1 Disk drive estimating a sinusoidal error in a wedge time period due to eccentricity in disk rotation 失效
标题翻译：磁盘驱动器估计由于盘旋转中的偏心导致的楔形时间段内的正弦误差
公开(公告)号：US07068451B1
公开(公告)日：2006-06-27
申请号：US10989674
申请日：2004-11-16
申请人： Zhi Wang , Jenghung Chen , David Dung Tien Nguyen
发明人： Zhi Wang , Jenghung Chen , David Dung Tien Nguyen
IPC分类号： G11B5/09
CPC分类号： G11B5/59627 , G11B20/1258 , G11B2020/1282
摘要： A disk drive and method for estimating a sinusoidal error in a wedge time period is disclosed. An estimated WTP is calculated according to: EST_WTP=RTP+â*cos(2πk/N)+{circumflex over (b)}*sin(2πk/N) wherein RTP is a reference time period corresponding to a nominal WTP, k is an index representing a servo wedge, and {â,{circumflex over (b)}} are adjustable coefficients. A wedge time error e(k) is estimated as the difference between the estimated WTP and a detected actual WTP. The coefficients {â,{circumflex over (b)}} for generating the estimated WTP are adjusted according to: â(k+1)=â(k)−G*e(k)*cos(2πk/N) {circumflex over (b)}(k+1)={circumflex over (b)}(k)−G*e(k)*sin(2πk/N) wherein G is a predetermined gain.
摘要翻译：公开了一种用于估计楔形时间段中的正弦误差的盘驱动器和方法。估计的WTP根据以下计算：<？in-line-formula description =“In-line Formulas”end =“lead”？> EST_WTP = RTP +â* cos（2pik / N）+ b * sin（2pik / N ）其中，RTP是与标称WTP对应的基准时间段，k是表示伺服楔的索引，{âb }是可调系数。估计楔形时间误差e（k）作为估计的WTP与检测到的实际WTP之间的差。用于生成估计的WTP的系数{â，b}根据：<？in-line-formula description =“In-line Formulas”end =“lead”？>â（k + 1）=â（k） -G * e（k）* cos（2pik / N）<？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“ “end =”lead“？> b（k + 1）= b（k）-G * e（k）* sin（2pik / N）<？in-line-formula description =”In-line Formulas“end = “尾”→其中G是预定的增益。

9. 发明授权

US06903897B1 Performance of a rotary actuator in a disk drive 有权
标题翻译：磁盘驱动器中旋转执行器的性能
公开(公告)号：US06903897B1
公开(公告)日：2005-06-07
申请号：US10607710
申请日：2003-06-27
申请人： Zhi Wang , Jenghung Chen
发明人： Zhi Wang , Jenghung Chen
IPC分类号： G11B5/55 , G11B5/596
CPC分类号： G11B5/5547 , G11B5/5534
摘要： A method for improving the performance of a rotary actuator in a disk drive, the rotary actuator comprises a voice coil motor (VCM) characterized by a torque parameter, the disk drive comprises a servo control system having a motor driver circuit for receiving a series of command effort signals (CEFs) transmitted based on a first seek profile, and for providing an operating current to VCM based on the CEFs for causing a movement of the actuator from a first radial location to a target radial location. The method includes recording the transmitted CEFs, and while actuator is moving: adjusting each recorded CEF to account for a disk drive influence on actuator movement; storing adjusted CEFs; monitoring velocity of moving actuator; calculating an acceleration value corresponding to moving actuator from the stored CEFs and monitored velocity; and adjusting the acceleration value to account for a radial torque parameter variation.
摘要翻译：一种用于提高盘驱动器中的旋转致动器的性能的方法，旋转致动器包括以扭矩参数为特征的音圈电机（VCM），该盘驱动器包括伺服控制系统，该伺服控制系统具有用于接收一系列基于第一搜索轮廓发送的命令努力信号（CEF），以及用于基于所述CEF将所述致动器的运动从第一径向位置移动到目标径向位置来向VCM提供工作电流。该方法包括记录发送的CEF，并且在致动器正在移动时：调整每个记录的CEF以考虑磁盘驱动器对致动器运动的影响; 存储调整后的CEF; 监控运动执行器的速度; 从存储的CEF计算对应于移动致动器的加速度值和监测速度; 并调整加速度值以解决径向转矩参数变化。

10. 发明授权

US07095579B1 Disk drive employing momentum based unload during power failure 有权
标题翻译：停电期间采用基于动量的卸载的磁盘驱动器
公开(公告)号：US07095579B1
公开(公告)日：2006-08-22
申请号：US11143839
申请日：2005-06-02
申请人： Robert P. Ryan , Ashok K. Desai , Hemant Melkote , Jenghung Chen , John R. Agness , Terry C. Dawson
发明人： Robert P. Ryan , Ashok K. Desai , Hemant Melkote , Jenghung Chen , John R. Agness , Terry C. Dawson
IPC分类号： G11B21/02
CPC分类号： G11B21/12
摘要： A disk drive is discloses comprising a disk, a head connected to a distal end of an actuator arm, and a voice coil motor (VCM) for rotating the actuator arm about a pivot in order to actuate the head radially over the disk. If when a power failure occurs the radial location of the head is less than a predetermined distance from the outer diameter of the disk, the VCM is controlled to move the head toward the inner diameter of the disk and stopping the head before it reaches the inner diameter of the disk. The VCM is then controlled to move the head toward the outer diameter of the disk until the actuator arm unloads onto a ramp.
摘要翻译：公开了一种磁盘驱动器，其包括盘，连接到致动器臂的远端的头部和用于围绕枢轴旋转致动器臂的音圈电动机（VCM），以便在盘上径向驱动头部。如果当电源故障发生时，磁头的径向位置小于距离磁盘外径的预定距离，则控制VCM使磁头向盘的内径移动并在磁头到达内部之前停止磁头磁盘的直径。然后控制VCM以使头朝向盘的外径移动，直到致动器臂卸载到斜坡上。

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