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1. 发明授权

US07046472B1 Method and apparatus for self servowriting of tracks of a disk drive using an observer based on an equivalent one-dimensional state model 有权
标题翻译：使用基于等效一维状态模型的观察者自动伺服磁盘驱动器的磁道的方法和装置
公开(公告)号：US07046472B1
公开(公告)日：2006-05-16
申请号：US10427475
申请日：2003-04-30
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 magnetic disk drive. In the method, track following is performed along a reference track, defined by previously written servo burst patterns, 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 the two-dimensional state model of the servo loop. Servo patterns are written at a target radial location on the magnetic disk medium 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 servo burst patterns at the target radial location.
摘要翻译：公开了一种用于在磁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。在该方法中，使用具有闭环响应的伺服环路，沿着由先前写入的伺服脉冲串模式定义的参考轨道执行跟踪。基于跟踪轨迹为参考轨道生成位置误差信号。基于跟踪使用与伺服环路的二维状态模型相当的一维状态模型的观察者的跟踪来生成校正信号。在跟踪轨道的跟踪期间，在磁盘介质上的目标径向位置处写入伺服模式。基于校正信号来调整伺服环路的位置误差信号，以减小在目标径向位置处从参考轨迹到伺服脉冲串图形的径向误差传播。

2. 发明授权

US06992848B1 Using an external spiral servo writer to write spiral reference patterns to a disk to facilitate writing product servo bursts to the disk 失效
标题翻译：使用外部螺旋伺服写入器将螺旋参考模式写入磁盘，以便于将产品伺服脉冲串写入磁盘
公开(公告)号：US06992848B1
公开(公告)日：2006-01-31
申请号：US10112282
申请日：2002-03-29
申请人： Vinay K. Agarwal , Robert L. Cloke
发明人： Vinay K. Agarwal , Robert L. Cloke
IPC分类号： G11B21/02
CPC分类号： G11B5/59633
摘要： A method of writing product servo bursts to a disk in a disk drive is disclosed. An external spiral servo writer comprising a head positioning pin and head positioning mechanics periodically writes a plurality of reference servo bursts in a plurality of spiral reference patterns to the disk. The reference servo bursts in the spiral reference patterns are processed to write product servo bursts to the disk. In one embodiment control circuitry within the disk drive processes the reference servo bursts to self-servo write the disk drive, and in another embodiment an external product servo writer processes the reference servo bursts to write the product servo bursts to the disk. In one embodiment, a slope of each spiral reference pattern is selected so that each spiral reference pattern is written over at least twenty revolutions of the disk to increase the accuracy of the head position error generated from the reference servo bursts.
摘要翻译：公开了将产品伺服脉冲串写入盘驱动器中的盘的方法。包括头定位销和头定位机构的外部螺旋伺服写入器周期性地将多个参考伺服脉冲串写入多个螺旋参考图案到盘。处理螺旋参考模式中的参考伺服脉冲串将产品伺服脉冲串写入磁盘。在一个实施例中，磁盘驱动器内的控制电路处理参考伺服突发以自动伺服写入磁盘驱动器，并且在另一实施例中，外部产品伺服写入器处理参考伺服脉冲以将产品伺服脉冲串写入磁盘。在一个实施例中，选择每个螺旋参考图案的斜率，使得每个螺旋参考图案被写在盘的至少二十圈上以增加从参考伺服脉冲串产生的磁头位置误差的精度。

3. 发明授权

US07016134B1 Using an external spiral servo writer to write spiral tracks to a disk to facilitate writing product servo sectors to the disk 失效
标题翻译：使用外部螺旋伺服写入器将螺旋轨迹写入磁盘，以便于将产品伺服扇区写入磁盘
公开(公告)号：US07016134B1
公开(公告)日：2006-03-21
申请号：US10946965
申请日：2004-09-21
申请人： Vinay K. Agarwal , Jack M. Chue , Robert L. Cloke
发明人： Vinay K. Agarwal , Jack M. Chue , Robert L. Cloke
IPC分类号： G11B5/09
CPC分类号： G11B5/59633 , G11B5/59661
摘要： A method of writing product servo sectors to a disk of a disk drive is disclosed. An external spiral servo writer writes a plurality of spiral tracks to the disk by actuating in a closed loop system a head positioning pin inserted into the disk drive. Each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark. The high frequency signal and sync marks in the spiral tracks are demodulated to maintain synchronization of a servo write clock as well as maintain the head along a circular target path while writing product servo sectors to the disk.
摘要翻译：公开了一种将产品伺服扇区写入磁盘驱动器的盘的方法。外部螺旋伺服写入器通过在闭环系统中致动插入盘驱动器中的头定位销来驱动多个螺旋轨道到盘。每个螺旋轨道包括通过同步标记以预定间隔中断的高频信号。解调螺旋轨道中的高频信号和同步标记，以保持伺服写入时钟的同步，并且在将产品伺服扇区写入盘时沿着圆形目标路径保持磁头。

4. 发明授权

US06999263B1 Method and apparatus for self servowriting of tracks of a disk drive using a servo control loop having a two-dimensional weighted digital state compensator 失效
标题翻译：使用具有二维加权数字状态补偿器的伺服控制回路来自动伺服磁盘驱动器的磁道的方法和装置
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。

5. 发明授权

US06975480B1 Method for determining repeatable runout cancellation values in a magnetic disk drive using filtering 失效
标题翻译：用于使用滤波来确定磁盘驱动器中的可重复跳动消除值的方法
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。

6. 发明授权

US06924961B1 Method and apparatus for self servowriting of tracks of a disk drive using an observer based on an equivalent one-dimensional state model 失效
标题翻译：使用基于等效一维状态模型的观察者自动伺服磁盘驱动器的磁道的方法和装置
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。

7. 发明授权

US06819518B1 Method and apparatus for self servowriting of tracks of a disk drive using a servo control loop having a two-dimensional digital state compensator 失效
标题翻译：使用具有二维数字状态补偿器的伺服控制回路自动伺服磁盘驱动器的磁道的方法和装置
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。

8. 发明授权

US5254920A Seek system for sector servo disk drive 失效
标题翻译：寻求系统的扇区伺服磁盘驱动器
公开(公告)号：US5254920A
公开(公告)日：1993-10-19
申请号：US715511
申请日：1991-06-14
申请人： Vinay K. Agarwal , Dan Cautis
发明人： Vinay K. Agarwal , Dan Cautis
IPC分类号： G11B7/085 , G05B11/01
CPC分类号： G11B7/08529
摘要： A servo system moving a transducer between tracks in a sector servo disk drive generates a velocity profile representing the variation of the desired velocity of the head in moving from a first track to a second track. The velocity profile has an acceleration phase and deceleration phase, with the transition from acceleration phase to deceleration phase identified as a switch point.The velocity of movement of the head is periodically sampled from the sector servo pattern in a sequence of sample periods during movement of the head. The energization of the head moving element is controlled so that the switch point occurs during one of the sample periods, thereby resulting in improved performance in positioning the head at the desired track. The system accommodates itself to variations, such as mechanical or electrical disturbances, which would otherwise affect the system.
摘要翻译：在扇区伺服盘驱动器中的轨道之间移动换能器的伺服系统产生速度曲线，其表示在从第一轨道移动到第二轨道时所需的头部速度的变化。速度曲线具有加速相位和减速阶段，从加速阶段到减速阶段的转换被确定为切换点。在头部移动期间，头部的移动速度以扇区伺服模式在采样周期的序列中周期性地采样。控制头部移动元件的激励，使得切换点在一个采样周期期间发生，从而导致将头部定位在期望轨道上的改进的性能。该系统适应自身的变化，例如机械或电气干扰，否则会影响系统。

9. 发明授权

US06693764B1 Method and disk drive for improving head position accuracy during track following through real-time identification of external vibration 有权
标题翻译：方法和磁盘驱动器，用于通过实时识别外部振动来提高跟踪跟踪期间的头部位置精度
公开(公告)号：US06693764B1
公开(公告)日：2004-02-17
申请号：US09775256
申请日：2001-01-31
申请人： Edgar D. Sheh , Hemant Melkote , Vinay K. Agarwal
发明人： Edgar D. Sheh , Hemant Melkote , Vinay K. Agarwal
IPC分类号： G11B5596
CPC分类号： G11B5/59627 , G11B5/59622 , G11B5/59694
摘要： The present invention may be embodied in a method and a disk drive for improving head position accuracy during track following through real-time identification of external vibration. A selected track is followed using a servo control loop having a nominal gain and being responsive to position error signal samples generated based on a difference between head position samples and a reference head position value. A spectral power value within a predetermined frequency band is determined from a sequence of the position error signal samples. If a property of the spectral power value exceeds a threshold, the gain of the servo control loop is increased within the predetermined frequency band to attenuate the effect of external vibration on the position of the head over the selected track during track following.
摘要翻译：本发明可以体现在一种方法和磁盘驱动器中，用于通过实时识别外部振动来提高跟踪跟踪期间的头部位置精度。使用具有额定增益的伺服控制回路来跟踪所选轨道，并响应于基于头位置采样和参考头位置值之间的差产生的位置误差信号样本。根据位置误差信号样本的序列确定预定频带内的频谱功率值。如果频谱功率值的属性超过阈值，则在预定频带内增加伺服控制环路的增益，以在跟踪期间衰减外部振动对所选择的轨道上的头部位置的影响。

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