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：US06999263B1

公开(公告)日：2006-02-14

申请号：US10788767

申请日：2004-02-27

申请人： Hemant Melkote ,  Robert L. Cloke ,  Vinay K. Agarwal

发明人： Hemant Melkote ,  Robert L. Cloke ,  Vinay K. Agarwal

IPC分类号： G11B5/596

CPC分类号： G11B5/59633

摘要： A method is disclosed for defining tracks on a rotating magnetic disk medium of a disk drive. Reference tracks are followed using a servo control loop while writing servo burst patterns defining a first target servo track. The servo control loop includes a two-dimensional digital state compensator having a first input that receives position error signals, a first output that generates control signals for positioning a transducer head, a second output that generates track-following state variables, and a second input that receives processed and stored track-following state variables. The first target track is followed using the servo control loop while servo burst patterns are written, and while the processed and stored track-following state variables corresponding to the servo burst patterns defining the first target track are applied to the second input.

摘要翻译： 公开了一种用于在盘驱动器的旋转磁盘介质上定义轨道的方法。 在编写定义第一目标伺服轨道的伺服脉冲串模式时，使用伺服控制回路遵循参考轨道。 伺服控制回路包括具有接收位置误差信号的第一输入的二维数字状态补偿器，产生用于定位换能器头的控制信号的第一输出，产生跟踪跟踪状态变量的第二输出和第二输入 它接收处理和存储的跟踪跟踪状态变量。 在伺服脉冲串模式被写入的同时跟踪使用伺服控制回路的第一目标轨道，并且与定义第一目标轨道的伺服脉冲串模式对应的处理和存储的跟踪跟踪状态变量被应用于第二输入。

公开(公告)号：US06963465B1

公开(公告)日：2005-11-08

申请号：US10882971

申请日：2004-06-29

申请人： Hemant Melkote ,  Robert J. McNab

发明人： Hemant Melkote ,  Robert J. McNab

IPC分类号： G11B5/596 ,  G11B21/02

CPC分类号： G11B5/59633 ,  G11B5/59655 ,  G11B5/59666

摘要： The present invention may be embodied in a method for preventing radial error propagation during self-servowriting of concentric tracks on a magnetic disk in a disk drive. Each written track comprises a plurality of embedded servo sectors that define a circumferential path and that eventually form corresponding servo wedges extending radially across the magnetic disk such that each servo sector t of a track corresponds to a particular servo wedge. In the method comprising, track following is performed along a previously written track and a position error signal is determined for each servo sector. A correction value is recursively estimated for each servo sector of an adjacent track. The correction value is for use in correcting a position error signal determined using the corresponding servo sector of the adjacent track to prevent radial error propagation from previously written track to the adjacent track.

摘要翻译： 本发明可以体现在用于在盘驱动器中的磁盘上的同心轨道的自伺服驱动期间防止径向误差传播的方法。 每个写入的轨道包括多个嵌入式伺服扇区，其限定圆周路径，并且最终形成径向延伸穿过磁盘的对应的伺服楔，使得轨道的每个伺服扇区t对应于特定的伺服楔。 在该方法中，沿着先前写入的轨道执行跟踪跟踪，并为每个伺服扇区确定位置误差信号。 对相邻轨道的每个伺服扇区递归地估计校正值。 校正值用于校正使用相邻轨道的相应伺服扇区确定的位置误差信号，以防止从先前写入的轨道到相邻轨道的径向误差传播。

公开(公告)号：US06826006B1

公开(公告)日：2004-11-30

申请号：US10262482

申请日：2002-09-30

申请人： Hemant Melkote ,  Russ A. Quisenberry

发明人： Hemant Melkote ,  Russ A. Quisenberry

IPC分类号： G11B5596

CPC分类号： G11B5/59627

摘要： A method is disclosed for recursively determining repeatable runout (RRO) cancellation values in a disk drive having a head disk assembly (HDA) and a sampled servo controller. The HDA includes a disk having distributed position information in servo wedges, a rotary actuator carrying a head that periodically reads the position information, and a voice coil motor circuit that responds to a control effort signal. The servo controller periodically adjusts the control effort signal during a track-following operation. In the method, resonant filter values for developing RRO cancellation values are iteratively learned and updated after each disk rotation during track following operations on a predetermined track until a threshold, such as a particular number of disk rotations, is obtained.

摘要翻译： 公开了一种用于递归地确定具有头盘组件（HDA）和采样伺服控制器的磁盘驱动器中的可重复跳动（RRO）消除值的方法。 HDA包括具有伺服楔形体中的分布位置信息的磁盘，承载周期性地读取位置信息的磁头的旋转致动器以及响应于控制力信号的音圈电机电路。 伺服控制器在跟踪跟踪操作期间周期性地调整控制功率信号。 在该方法中，用于开发RRO抵消值的谐振滤波器值在轨道跟踪操作之后的每个盘旋转之后在预定轨道上被迭代地学习和更新，直到获得诸如特定数量的盘旋转之类的阈值。

公开(公告)号：US07298574B1

公开(公告)日：2007-11-20

申请号：US11431303

申请日：2006-05-10

申请人： Hemant Melkote ,  Robert J. McNab

发明人： Hemant Melkote ,  Robert J. McNab

IPC分类号： G11B21/02 ,  G11B5/58 ,  G11B5/596 ,  G11B15/12

CPC分类号： G11B5/59616 ,  G11B5/59633 ,  G11B5/59666

摘要： Servo writing a disk of a disk drive is disclosed. A phase locked loop (PLL) is synchronized to first sectors previously written on a first track, and second sectors are written to a second track using the PLL, wherein a plurality of phase errors corresponding to the second sectors are saved. A correction value is computed corresponding to a selected one of the second sectors, wherein the correction value is computed in response to a plurality of the phase errors generated for a plurality of the second sectors leading the selected sector. The PLL is synchronized to the second sectors using the correction value, a third sector is written to a third track using the PLL, and a phase error is saved corresponding to the third sector.

摘要翻译： 公开了写入磁盘驱动器的磁盘的伺服。 锁相环（PLL）与先前写在第一磁道上的第一扇区同步，并且使用PLL将第二扇区写入第二磁道，其中保存对应于第二扇区的多个相位误差。 对应于所选择的第二扇区之一来计算校正值，其中响应于导致所选扇区的多​​个第二扇区产生的多个相位误差来计算校正值。 PLL使用校正值与第二扇区同步，使用PLL将第三扇区写入第三磁道，并且相应于第三扇区保存相位误差。

公开(公告)号：US06999267B1

公开(公告)日：2006-02-14

申请号：US10835446

申请日：2004-04-28

申请人： Hemant Melkote ,  Zhi Wang

发明人： Hemant Melkote ,  Zhi Wang

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： The present invention may be embodied in a method of determining a repeatable runout (RRO) compensation value set for a data track on a magnetic disk in a disk drive. The track comprises a plurality of embedded sectors that define a circumferential path having RRO requiring compensation during data read and write operation. In the method, track following is performed along the track and a position error signal (PES) is determined for each servo sector. An RRO compensation value is iteratively learned for each servo sector using the previously learned value for the servo sector and using the PES for the servo sector and for adjacent servo sectors.

摘要翻译： 本发明可以体现在确定对于磁盘驱动器中的磁盘上的数据轨道设置的可重复跳动（RRO）补偿值的方法中。 轨道包括多个嵌入扇区，其限定了在数据读取和写入操作期间需要补偿的RRO的圆周路径。 在该方法中，轨道跟踪是沿轨道执行的，并且为每个伺服扇区确定位置误差信号（PES）。 对于每个伺服扇区，使用先前学习的伺服扇区的值并且使用用于伺服扇区的PES和相邻的伺服扇区来迭代地学习RRO补偿值。

公开(公告)号：US06975480B1

公开(公告)日：2005-12-13

申请号：US10125007

申请日：2002-04-17

申请人： Raffi Codilian ,  Hemant Melkote ,  Vinay K. Agarwal

发明人： Raffi Codilian ,  Hemant Melkote ,  Vinay K. Agarwal

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A method is disclosed for determining repeatable runout (RRO) cancellation values in a disk drive having a head disk assembly (HDA) and a sampled servo controller. The HDA includes a disk having distributed position information in servo wedges, a rotary actuator carrying a head that periodically reads the position information, and a voice coil motor circuit that responds to a control effort signal. The servo controller periodically adjusts the control effort signal during a track-following operation. In the method, the position information related to a predetermined track is read during track following for more than one disk rotation. The position information is averaged for each servo wedge obtained during the disk rotations. The averaged servo position values are filtered with a filter for compensating effects of the sampled servo controller, which tend to distort the averaged servo position values, to generate the RRO cancellation values for the predetermined track.

摘要翻译： 公开了一种用于确定具有头盘组件（HDA）和采样伺服控制器的磁盘驱动器中的可重复跳动（RRO）消除值的方法。 HDA包括具有伺服楔形体中的分布位置信息的磁盘，承载周期性地读取位置信息的磁头的旋转致动器以及响应于控制力信号的音圈电机电路。 伺服控制器在跟踪跟踪操作期间周期性地调整控制功率信号。 在该方法中，在多于一个盘旋转的跟踪期间，读取与预定轨迹有关的位置信息。 对于在盘旋转期间获得的每个伺服楔，平均位置信息。 平均的伺服位置值用滤波器进行滤波，用于补偿采样伺服控制器的影响，倾向于使平均伺服位置值失真，以产生预定轨迹的RRO抵消值。

公开(公告)号：US06937420B1

公开(公告)日：2005-08-30

申请号：US10856658

申请日：2004-05-28

申请人： Robert J. McNab ,  Hemant Melkote

发明人： Robert J. McNab ,  Hemant Melkote

IPC分类号： G11B5/596 ,  G11B21/02

CPC分类号： G11B5/59655 ,  G11B5/59627 ,  G11B5/59661 ,  G11B5/59666

摘要： Disclosed is a method for generating a repeatable runout (RRO) compensation value set for a circular track on a magnetic medium on a surface of a disk in a disk drive. The magnetic medium has a plurality of previously written spiral servo tracks for providing position information during a self servo-writing operation. In the method, servo burst patterns are written at a plurality of radial locations on the magnetic data storage surface during circular tracking operations using the spiral servo tracks, and respective position error signals generated during the circular tracking operations are stored. The servo burst patterns at the plurality of radial locations define a circular data track. The RRO compensation value set for the circular data track may be generated based on the respective stored position error signals generated during the circular tracking operations for writing the servo burst patterns at the plurality of radial locations.

摘要翻译： 本发明公开了一种用于为盘驱动器中的盘表面上的磁介质上的圆形轨道生成可重复跳动（RRO）补偿值的方法。 磁介质具有多个预先写入的螺旋伺服磁道，用于在自伺服写入操作期间提供位置信息。 在该方法中，在使用螺旋伺服磁道的循环跟踪操作期间，在磁数据存储表面上的多个径向位置处写入伺服脉冲串图形，并且存储在循环跟踪操作期间产生的各个位置误差信号。 多个径向位置处的伺服脉冲串图案限定圆形数据轨迹。 可以基于在用于在多个径向位置处写入伺服脉冲串图案的循环跟踪操作期间产生的相应存储的位置误差信号来生成针对圆形数据轨道设置的RRO补偿值。

公开(公告)号：US06924961B1

公开(公告)日：2005-08-02

申请号：US10232640

申请日：2002-08-30

申请人： Hemant Melkote ,  Robert L. Cloke ,  Vinay K. Agarwal

发明人： Hemant Melkote ,  Robert L. Cloke ,  Vinay K. Agarwal

IPC分类号： G11B5/596

CPC分类号： G11B5/59655

摘要： A method is disclosed for writing servo patterns for tracks on a rotating magnetic disk medium of a disk drive. Servo patterns are written on a reference track of the disk medium. Track following of the written servo patterns on the reference track is performed using a servo loop having a closed-loop response. A position error signal is generated for the reference track based on the track following. A correction signal is generated based on the track following using an observer of a one-dimensional state model that is equivalent to a two-dimensional state model of the servo loop. Servo patterns are written on a target track during track following of the reference track. The position error signal of the servo loop is adjusted based on the correction signal to reduce radial error propagation from the reference track to the target track.

摘要翻译： 公开了一种用于在盘驱动器的旋转磁盘介质上写入用于轨道的伺服模式的方法。 伺服模式写在盘介质的参考轨道上。 使用具有闭环响应的伺服环路来执行跟踪在参考轨道上的写入的伺服模式。 基于跟踪轨迹为参考轨道生成位置误差信号。 基于跟踪使用等同于伺服环路的二维状态模型的一维状态模型的观察者的轨迹生成校正信号。 在跟踪轨道的跟踪期间，伺服模式被写在目标轨道上。 基于校正信号调整伺服环路的位置误差信号，以减小从参考轨道到目标轨道的径向误差传播。

公开(公告)号：US06819518B1

公开(公告)日：2004-11-16

申请号：US10280603

申请日：2002-10-24

申请人： Hemant Melkote ,  Robert L. Cloke ,  Vinay K. Agarwal

发明人： Hemant Melkote ,  Robert L. Cloke ,  Vinay K. Agarwal

IPC分类号： G11B2102

CPC分类号： G11B5/59633

摘要： A method is disclosed for defining tracks on a rotating magnetic disk medium of a disk drive. Reference tracks are followed using a servo control loop while writing servo burst patterns defining a first target servo track. The servo control loop includes a two-dimensional digital state compensator having a first input that receives position error signals, a first output that generates control signals for positioning a transducer head, a second output that generates track-following state variables, and a second input that receives stored track-following state variables. The first target track is followed using the servo control loop while servo burst patterns are written, and while the stored track-following state variables corresponding to the servo burst patterns defining the first target track are applied to the second input.

摘要翻译： 公开了一种用于在盘驱动器的旋转磁盘介质上定义轨道的方法。 在编写定义第一目标伺服轨道的伺服脉冲串模式时，使用伺服控制回路遵循参考轨道。 伺服控制回路包括具有接收位置误差信号的第一输入的二维数字状态补偿器，产生用于定位换能器头的控制信号的第一输出，产生跟踪跟踪状态变量的第二输出和第二输入 它接收存储的跟踪跟踪状态变量。 在伺服脉冲串模式被写入的同时跟踪使用伺服控制回路的第一目标轨迹，并且在将定义了第一目标轨道的伺服脉冲串模式对应的所存储的跟踪跟踪状态变量应用于第二输入。