公开(公告)号：US07697233B1

公开(公告)日：2010-04-13

申请号：US12255542

申请日：2008-10-21

申请人： George J. Bennett ,  Orhan Beker ,  Aswartha Narayana

发明人： George J. Bennett ,  Orhan Beker ,  Aswartha Narayana

IPC分类号： G11B21/02 ,  G11B5/55 ,  G11B5/596

CPC分类号： G11B5/5547 ,  G11B5/59605

摘要： A disk drive is disclosed comprising a disk, a head, and an actuator for actuating the head over the disk. The disk drive further comprises a state variable memory for storing a plurality of state variable sets, wherein each state variable set comprises a plurality of state variables and each state variable set corresponds to a task object. A coefficient memory for stores a plurality of coefficient sets, wherein each coefficient set comprises a plurality of coefficients and each coefficient set corresponds to a task object. A task object is executed by initializing a base state register to address a selected one of the state variable sets in the state variable memory, and initializing a base coefficient register to address a selected one of the coefficient sets in the coefficient memory.

摘要翻译： 公开了一种磁盘驱动器，其包括用于在盘上致动磁头的磁盘，磁头和致动器。 磁盘驱动器还包括用于存储多个状态变量集合的状态变量存储器，其中每个状态变量集合包括多个状态变量，并且每个状态变量集对应于任务对象。 一种用于存储多个系数组的系数存储器，其中每个系数组包括多个系数，并且每个系数组对应于任务对象。 通过初始化基本状态寄存器来对状态变量存储器中的状态变量集合中的一个选择的一个进行初始化，并且初始化基本系数寄存器以对系数存储器中的所选择的一个系数集进行寻址来执行任务对象。

公开(公告)号：US08553351B1

公开(公告)日：2013-10-08

申请号：US13267196

申请日：2011-10-06

申请人： Aswartha Narayana ,  Chuanwen Ji ,  Duc T. Phan ,  Min Chen ,  Hengchang Guo

发明人： Aswartha Narayana ,  Chuanwen Ji ,  Duc T. Phan ,  Min Chen ,  Hengchang Guo

IPC分类号： G11B21/02

CPC分类号： G11B5/596 ,  G11B5/59644

摘要： A disk drive is disclosed comprising a head actuated over a disk, the disk comprising a plurality of servo tracks defined by a plurality of servo sectors. An estimated radial location of the head is generated in response to an actuator control signal. A Gray coded track ID is detected from reading a servo sector, and decoded into a detected track ID. A burst position error signal (PES) is generated from reading servo bursts in the servo sector, wherein the burst PES represents a detected fractional servo track offset of the head. When the detected track ID is corrupt, a corrected track ID is generated using the estimated radial location and the burst PES, and the actuator control signal is adjusted in response to the corrected track ID and the burst PES.

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，磁盘包括由多个伺服扇区限定的多个伺服磁道。 响应于致动器控制信号产生头部的估计的径向位置。 通过读取伺服扇区来检测灰色编码轨道ID，并将其解码为检测到的轨迹ID。 脉冲串位置误差信号（PES）是从伺服扇区的伺服脉冲串中产生的，其中脉冲串PES表示检测到的磁头的分数伺服磁道偏移。 当检测到的磁道ID被破坏时，使用估计的径向位置和突发PES产生校正的磁道ID，并且响应于校正的磁道ID和突发PES调整致动器控制信号。

公开(公告)号：US06710966B1

公开(公告)日：2004-03-23

申请号：US10003943

申请日：2001-10-23

申请人： Raffi Codilian ,  Aswartha Narayana ,  Lan V. Ngo

发明人： Raffi Codilian ,  Aswartha Narayana ,  Lan V. Ngo

IPC分类号： G11B5596

CPC分类号： G11B5/59627 ,  G11B5/59694

摘要： The present invention may be embodied in a method, implemented in a disk drive, for adaptively reducing an effect of vibration during a track following operation. The disk drive includes a disk and a rotary actuator. The disk includes distributed position information in a plurality of servo wedges. The actuator carries a transducer and pivots on a base of the disk drive. The actuator may exhibit an imbalance that may be affected by a linear vibration. In the method, a sensor signal is generated that is responsive to a vibration to the disk drive. The sensor value is modified based on an adaptive-filter gain to generate a position error adjustment signal for modifying a nominal position error signal. The adaptive-filter gain is then altered based on an adjusted position error signal and the sensor value associated with the current servo wedge for use during a next servo wedge.

摘要翻译： 本发明可以以在磁盘驱动器中实施的方法来实现，用于在跟踪操作期间自适应地减小振动的影响。 磁盘驱动器包括盘和旋转致动器。 盘包括多个伺服楔中的分布位置信息。 执行器承载一个传感器并在磁盘驱动器的基座上枢转。 致动器可能表现出可能受到线性振动影响的不平衡。 在该方法中，产生响应于磁盘驱动器的振动的传感器信号。 基于自适应滤波器增益修改传感器值，以产生用于修改标称位置误差信号的位置误差调整信号。 然后基于调整的位置误差信号和与当前伺服楔形件相关联的传感器值来改变自适应滤波器增益，以在下一个伺服楔形中使用。

公开(公告)号：US08767343B1

公开(公告)日：2014-07-01

申请号：US13454752

申请日：2012-04-24

申请人： Daniel L. Helmick ,  Donald Brunnett ,  Aswartha Narayana ,  Duc T. Phan

发明人： Daniel L. Helmick ,  Donald Brunnett ,  Aswartha Narayana ,  Duc T. Phan

IPC分类号： G11B5/596

CPC分类号： G11B5/5547

摘要： A disk drive is disclosed comprising a disk comprising a plurality of data tracks, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk. When an access command is received to access a target data track, a seek operation is initiated to seek the head toward the target data track, wherein the seek operation includes integrating a first state of the servo control system and limiting an output range of the integrating. The output range of the integrating is increased during the seek operation, for example, if an error occurs during the seek operation.

摘要翻译： 公开了一种磁盘驱动器，包括包括多个数据磁道的磁盘，磁头和控制电路，其包括可操作以使磁头在盘上起动的伺服控制系统。 当接收到访问目标数据轨道的访问命令时，启动搜索操作以朝向目标数据轨道寻找头，其中寻道操作包括对伺服控制系统的第一状态进行积分并限制积分的输出范围 。 在搜索操作期间积分的输出范围增加，例如，如果在搜索操作期间发生错误。

公开(公告)号：US08542455B2

公开(公告)日：2013-09-24

申请号：US13298133

申请日：2011-11-16

申请人： Yanan Huang ,  Alexander Babinski ,  Duc T. Phan ,  Aswartha Narayana

发明人： Yanan Huang ,  Alexander Babinski ,  Duc T. Phan ,  Aswartha Narayana

IPC分类号： G11B5/02

CPC分类号： G11B5/5547 ,  G11B5/596

摘要： A disk drive is disclosed comprising a disk including a plurality of servo tracks, wherein each servo track comprises a plurality of servo sectors. The disk drive further comprises an actuator for actuating a head over the disk in response to an actuator control signal. The servo sectors are read to generate a first sequence of control samples x[k] at a sample rate corresponding to a frequency of the servo sectors. The first sequence of control samples x[k] is upsampled by a factor of N to generate a second sequence of control samples y[ki] according to: y ⁡ [ k i ⁢ | i = 1 : N ] = ( 1 - i N - γ ) ⁢ u ⁡ [ k - 1 ] + ( i N + γ ) ⁢ u ⁡ [ k ] where γ is a scalar greater than or equal to zero and less than one. The actuator control signal is generated in response to the second sequence of control samples y[ki].

摘要翻译： 公开了一种盘驱动器，其包括包括多个伺服轨道的盘，其中每个伺服轨道包括多个伺服扇区。 磁盘驱动器还包括用于响应于致动器控制信号而将磁头驱动到磁盘上的致动器。 读取伺服扇区，以对应于伺服扇区的频率的采样率产生第一控制样本序列x [k]。 控制样本x [k]的第一序列由N因子进行上采样，以根据以下方式生成第二控制样本序列y：：y⁡[k i | i = 1：N] =（1-i N-γ）u⁡[k-1] +（i N + gamma）u⁡[k]其中，γ是大于或等于零且小于 一。 致动器控制信号响应于控制样本的第二序列y i而被产生。

公开(公告)号：US07679854B1

公开(公告)日：2010-03-16

申请号：US12260919

申请日：2008-10-29

申请人： Aswartha Narayana ,  John Yin Kwong Li ,  Gary Gaoxiang Zhu ,  Jonathan V. Nguyen ,  Duc T. Phan

发明人： Aswartha Narayana ,  John Yin Kwong Li ,  Gary Gaoxiang Zhu ,  Jonathan V. Nguyen ,  Duc T. Phan

IPC分类号： G11B15/12 ,  G11B21/02

CPC分类号： G11B5/5547

摘要： A disk drive for implementing a head switch operation is disclosed. The disk drive comprises: an actuator; a first head and a second head attached to the actuator; a disk having a plurality of tracks; and a processor. The processor controls operations in the disk drive including: executing a head switch command from the first head to the second head; determining that a sync-up operation is not successful for the second head at a first track; applying a torque to the actuator to move the second head to a second track; and determining that the sync-up operation is successful.

摘要翻译： 公开了一种用于实现磁头开关操作的磁盘驱动器。 磁盘驱动器包括：致动器; 附接到致动器的第一头部和第二头部; 具有多个轨道的盘; 和处理器。 处理器控制磁盘驱动器中的操作，包括：执行从第一磁头到第二磁头的磁头开关命令; 确定第一磁道在第二磁头上的同步操作不成功; 向致动器施加扭矩以将第二头部移动到第二轨道; 并确定同步操作成功。

公开(公告)号：US06914743B1

公开(公告)日：2005-07-05

申请号：US09728626

申请日：2000-11-30

申请人： Aswartha Narayana ,  Raffi Codilian ,  Lan V. Ngo

发明人： Aswartha Narayana ,  Raffi Codilian ,  Lan V. Ngo

IPC分类号： G11B5/55 ,  G11B5/596

CPC分类号： G11B5/5582 ,  G11B5/59694

摘要： Disclosed is a disk drive using an accelerometer to sense linear vibration and cancel its effects with an adaptive algorithm during track following. The accelerometer is oriented to detect acceleration associated with torque that tends to cause the actuator to move off-track notwithstanding the efforts of the servo control system. The accelerometer's filtered output is used to modify the control effort. The disk drive uses the position error signal to adaptively filter the accelerometer's output in an effort to mathematically converge on a set of optimal filter coefficients and thereby reduce the effect of vibration that may otherwise impose a torque on the actuator.

摘要翻译： 公开了一种磁盘驱动器，其使用加速度计来感测线性振动并且在跟踪期间利用自适应算法来消除其影响。 加速度计被定向以检测与扭矩相关联的加速度，尽管伺服控制系统的努力，倾向于使致动器移动离开轨道。 加速度计的滤波输出用于修改控制功能。 磁盘驱动器使用位置误差信号来自适应地过滤加速度计的输出，以便在数学上收敛于一组最佳滤波器系数，从而减少否则在致动器上施加扭矩的振动的影响。