公开(公告)号：US07580212B1

公开(公告)日：2009-08-25

申请号：US11393105

申请日：2006-03-30

申请人： John Yin Kwong Li ,  David Dung Tien Nguyen

发明人： John Yin Kwong Li ,  David Dung Tien Nguyen

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59627

摘要： The present invention may be embodied in a magnetic disk, of a disk drive, having eight-bit fields storing wedge repeatable runout (WRRO) compensation values and redundancy information. The WRRO compensation value of each field includes a six-bit binary value of which five bits represent a compensation magnitude and one bit represents a sign bit indicating a compensation direction. The redundancy information of each field has a first bit based on the sign bit.

摘要翻译： 本发明可以实施在磁盘驱动器的磁盘中，具有存储楔形可重复跳动（WRRO）补偿值和冗余信息的八位字段。 每个场的WRRO补偿值包括六位二进制值，其中五位表示补偿量，一位表示表示补偿方向的符号位。 每个字段的冗余信息具有基于符号位的第一位。

公开(公告)号：US07110214B1

公开(公告)日：2006-09-19

申请号：US11039401

申请日：2005-01-18

申请人： Kuang-Yang Tu ,  David Dung Tien Nguyen

发明人： Kuang-Yang Tu ,  David Dung Tien Nguyen

IPC分类号： G11B5/596

CPC分类号： G11B5/5547

摘要： Disclosed is a disk drive including an actuator having a coil, a head attached to the actuator, and a disk including at least a first track and a second track, and a processor for controlling operations in the disk drive including a seek operation from the first track to the second track in which the head is moved between the first track and the second track by the movement of the actuator. The processor under the control of a program generates a deceleration velocity profile for the seek operation that is determined based upon a deceleration velocity profile function that includes a back electromagnetic force (BEMF) model to take into account back electromagnetic forces (BEMFs) associated with the coil of the actuator such that the BEMFs are mathematically modeled. The head is commanded to seek to the second track utilizing the deceleration velocity profile function that includes the BEMF model.

摘要翻译： 公开了一种盘驱动器，其包括具有线圈的致动器，附接到致动器的头部和至少包括第一轨道和第二轨道的盘，以及用于控制盘驱动器中的操作的处理器，包括来自第一 通过致动器的移动跟踪头部在第一轨道和第二轨道之间移动的第二轨道。 在程序控制下的处理器产生用于搜索操作的减速度速度分布，其基于包括反电磁力（BEMF）模型的减速度速度分布函数来确定，以考虑与相关联的反电磁力（BEMF） 线圈，使得BEMF在数学上被建模。 命令头使用包括BEMF模型的减速度曲线函数来寻求第二轨。

公开(公告)号：US07265933B1

公开(公告)日：2007-09-04

申请号：US11152415

申请日：2005-06-14

申请人： Bang X. Phan ,  David Dung Tien Nguyen ,  Zhi Wang

发明人： Bang X. Phan ,  David Dung Tien Nguyen ,  Zhi Wang

IPC分类号： G11B5/596 ,  G11B5/55

CPC分类号： G11B5/59627

摘要： A disk drive is disclosed comprising a voice coil motor (VCM) for rotating an actuator arm about a pivot in order to actuate a head over a disk. The disk is rotated by a spindle motor, and a feed-forward compensation value is computed that compensate for a non-centric alignment of the disk with respect to the spindle motor. During a calibration mode, the VCM is controlled to press the actuator arm against a crash stop, and the feed-forward compensation value is computed in response to a position error signal (PES). The PES is generated in response to embedded servo sectors recorded on the disk, wherein each embedded servo sector comprises a track address for coarse alignment and servo bursts for fine alignment.

摘要翻译： 公开了一种磁盘驱动器，其包括音圈电机（VCM），用于围绕枢轴旋转致动器臂，以便在磁盘上驱动磁头。 磁盘由主轴电动机旋转，并且计算前馈补偿值，其补偿盘相对于主轴电机的非中心对准。 在校准模式期间，VCM被控制以将致动器臂压向紧急停止，并且响应于位置误差信号（PES）来计算前馈补偿值。 响应于记录在盘上的嵌入式伺服扇区产生PES，其中每个嵌入式伺服扇区包括用于粗略对准的轨道地址和用于精细对准的伺服脉冲串。

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：US5793558A

公开(公告)日：1998-08-11

申请号：US658345

申请日：1996-06-05

申请人： Raffi Codilian ,  David Dung Tien Nguyen

发明人： Raffi Codilian ,  David Dung Tien Nguyen

IPC分类号： G11B5/55 ,  G11B21/08 ,  G11B5/596

CPC分类号： G11B21/083 ,  G11B5/5547 ,  G11B5/5534

摘要： A method and system for a disk drive that estimates demand DAC saturation current by performing a first slew with the demand DAC in saturation, and then iteratively refining the estimate in response to a sequence of slews with the demand DAC not in saturation. Each successive slew is performed with the demand DAC preloaded with an acceleration value calculated in the previous iteration. To perform each slew, the disk drive microcontroller loads the demand DAC with an acceleration value, waits a predetermined time interval, and reads servo signals to identify the track to which the head has slewed at the end of the time interval. The microcontroller then calculates the distance traveled by the actuator during the present slew and uses the ratio of this head travel distance to the head travel distance of the first (saturated) slew to refine the saturated acceleration value estimated in the previous iteration. These estimates converge over successive iterations toward the desired demand DAC saturation current.

摘要翻译： 一种磁盘驱动器的方法和系统，其通过在需求DAC饱和时执行第一次转换来估计需求DAC饱和电流，然后响应于需求DAC不饱和的一系列压摆迭代地改进估计。 每个连续的转换是在需要的DAC预先加载上一个迭代中计算的加速度值来执行的。 为了执行每个转换，磁盘驱动器微控制器以加速度值加载需求DAC，等待预定的时间间隔，并且读取伺服信号以在时间间隔结束时识别磁头已经被舍弃的磁道。 然后，微控制器计算在当前转动期间由致动器行进的距离，并且使用该头行程距离与第一（饱和）转数的磁头移动距离的比率来细化在先前迭代中估计的饱和加速度值。 这些估计在连续的迭代中收敛到期望的需求DAC饱和电流。

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：US06995941B1

公开(公告)日：2006-02-07

申请号：US11031616

申请日：2005-01-07

申请人： Masao Miyamura ,  David Dung Tien Nguyen

发明人： Masao Miyamura ,  David Dung Tien Nguyen

IPC分类号： G11B21/02

CPC分类号： G11B5/596

摘要： A method is disclosed for improving head position determination in a disk drive having a transducer head and a rotating disk with a plurality of embedded servo wedges for defining a plurality of concentric data tracks. Each servo wedge has a plurality of servo bursts for providing radial track position information. In the method, the servo bursts within a servo wedge are read and a burst amplitude is determined for each servo burst. The burst amplitudes are compared to determine a radial servo position zone. A fine radial head position within the radial servo position zone is determined based on a ratio having a numerator consisting of an algebraic sum and difference of the burst amplitudes and a denominator consisting of an algebraic difference between a largest burst amplitude and a smallest burst amplitude.

摘要翻译： 公开了一种用于改进磁盘驱动器中的磁头位置确定的方法，该磁盘驱动器具有换能器头和具有用于限定多个同心数据磁道的多个嵌入式伺服楔的旋转盘。 每个伺服楔具有用于提供径向轨迹位置信息的多个伺服脉冲串。 在该方法中，读取伺服楔内的伺服脉冲串，并为每个伺服脉冲串确定脉冲串幅度。 比较突发幅度以确定径向伺服位置区域。 基于具有由代数和和脉冲串幅度的差和由最大突发幅度和最小突发幅度之间的代数差组成的分母组成的分子的比率来确定径向伺服位置区域内的精细的径向头部位置。

公开(公告)号：US6014283A

公开(公告)日：2000-01-11

申请号：US856670

申请日：1997-05-15

申请人： Raffi Codilian ,  Ara W. Nazarian ,  David Dung Tien Nguyen

发明人： Raffi Codilian ,  Ara W. Nazarian ,  David Dung Tien Nguyen

IPC分类号： G11B5/00 ,  G11B5/596

CPC分类号： G11B5/59688 ,  G11B2005/0016 ,  G11B5/59655 ,  G11B5/59683

摘要： A magnetic storage disk drive having a servo burst pattern which asymmetrically increases the linear region in which a read head may be micro-jogged from a burst pair center line to align the read head with a data track. The innovative servo pattern comprises a first pair of servo bursts that define a first burst pair centerline for writing a particular data track to a data track side of the first centerline, and a second pair of servo bursts collectively define a second burst pair centerline that is positioned to the data track side of the first burst pair centerline and is sufficiently close to the first burst pair center line so that the read head "sees" the second pair of servo bursts before "losing" the first pair of servo bursts when micro-jogged to the data track side for reading. The second burst pair centerline should be no farther from the first burst pair centerline than the linear read width of the read head. The preferred servo bursts span a full track pitch are arranged in a uniformly repeating pattern of A/B and C/D burst pairs. The first burst pair centerline may be defined by the A/B pairs in one annular disk region and by the C/D burst pairs in another annular disk region in order to asymmetrically expand the linear region in the direction needed for micro-jogging the read head in different directions within the respective annular regions.

摘要翻译： 具有伺服突发图案的磁存储盘驱动器，其不对称地增加读取头可以从脉冲串对中心线微点击以将读取头与数据轨道对准的线性区域。 创新的伺服模式包括第一对伺服突发，其定义用于将特定数据轨迹写入第一中心线的数据轨道侧的第一突发对中心线，第二对伺服脉冲串共同定义第二突发对中心线， 位于第一突发对中心线的数据轨道侧并且足够接近第一突发对中心线，使得读取头在“丢失”第一对伺服脉冲串之前“看到”第二对伺服脉冲串， 慢跑到数据轨道侧进行阅读。 第二个突发对中心线应该不比第一个突发对中心线远离读取头的线性读取宽度。 以A / B和C / D突发对的均匀重复模式布置跨越全轨道间距的优选伺服突发。 第一突发对中心线可以由一个环形盘区域中的A / B对和另一个环形盘区域中的C / D突发对来限定，以便在读取微步数所需的方向上不对称地扩展线性区域 在各个环形区域内以不同的方向头部。

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。