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。

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。

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：

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。

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。

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。

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。

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。

公开(公告)号：US08760796B1

公开(公告)日：2014-06-24

申请号：US13153282

申请日：2011-06-03

申请人： Mingji Lou ,  Orhan Beker ,  Jenghung Chen

发明人： Mingji Lou ,  Orhan Beker ,  Jenghung Chen

IPC分类号： G11B5/596

CPC分类号： G11B5/5526 ,  G11B5/5586

摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks, wherein each track comprises a plurality of servo sectors. When entering an idle mode, the head is floated over the disk, and when exiting the idle mode, a radial velocity of the head is measured, a seek distance is determined in response to the radial velocity, and a seek operation seeks the head the seek distance to a first track.

摘要翻译： 公开了一种磁盘驱动器，包括在包括多个磁道的盘上致动的磁头，其中每个磁道包括多个伺服扇区。 当进入空闲模式时，磁头浮在磁盘上，当退出空闲模式时，测量磁头的径向速度，根据径向速度确定寻道距离，寻道操作将磁头 寻找到第一轨的距离。

公开(公告)号：US08724245B1

公开(公告)日：2014-05-13

申请号：US13529861

申请日：2012-06-21

申请人： Steven C. Smith ,  Charles A. Park ,  Siri S. Weerasooriya ,  Jenghung Chen ,  Guoxiao Guo ,  Wei Guo

发明人： Steven C. Smith ,  Charles A. Park ,  Siri S. Weerasooriya ,  Jenghung Chen ,  Guoxiao Guo ,  Wei Guo

IPC分类号： G11B5/09

CPC分类号： G11B5/59616 ,  G11B5/5526 ,  G11B20/10222 ,  G11B2020/1232

摘要： A disk drive is disclosed comprising a head actuated over a disk, the disk comprising a plurality of servo sectors defining a plurality of servo tracks, wherein the servo tracks form a plurality of servo zones. A servo data rate of servo sectors in a first servo zone is different than a servo data rate of servo sectors in a second servo zone. A boundary of a first servo zone overlaps with a boundary of a second servo zone over a transition zone. The servo sectors of the first servo zone are interleaved with the servo sectors of the second servo zone within the transition zone. At least one servo parameter is adjusted when the head is over the transition zone in order to transition between the first servo zone and the second servo zone.

摘要翻译： 公开了一种磁盘驱动器，其包括在盘上致动的磁头，盘包括限定多个伺服磁道的多个伺服扇区，其中伺服磁道形成多个伺服区。 第一伺服区域中的伺服扇区的伺服数据速率与第二伺服区域中的伺服扇区的伺服数据速率不同。 第一伺服区的边界与过渡区上的第二伺服区的边界重叠。 第一伺服区的伺服扇区与过渡区内的第二伺服区的伺服扇区交错。 当头部在过渡区域上时，至少调整一个伺服参数，以便在第一个伺服区域和第二个伺服区域之间转换。