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1. 发明授权

US07679854B1 Head switch operation for a disk drive 失效
标题翻译：磁头驱动器的磁头开关操作
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。

2. 发明授权

US07576941B1 Disk drive writing wedge RRO values in a butterfly pattern 失效
标题翻译：磁盘驱动器写入楔形RRO值为蝴蝶图案
公开(公告)号：US07576941B1
公开(公告)日：2009-08-18
申请号：US11924830
申请日：2007-10-26
申请人： Teddy T. C. Chen , Eugene Chun-Tsing Wu , John Yin Kwong Li , Jie Yu , Jonathan V. Nguyen , Tuong M. Vu , Guoxiao Guo
发明人： Teddy T. C. Chen , Eugene Chun-Tsing Wu , John Yin Kwong Li , Jie Yu , Jonathan V. Nguyen , Tuong M. Vu , Guoxiao Guo
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： A disk drive is disclosed comprising a plurality of servo sectors that define a plurality of tracks, and a head comprising a read element radially offset from a write element. The read element is positioned over a first track, and the first track is read to generate first read wedge repeatable runout (WRRO) values. A first seek operation of the head positions the read element over a second track, and the second track is read to generate first write WRRO values. The first write WRRO values are used to write the first read WRRO values to the first track. A second seek operation of the head positions the read element over a third track, and the third track is read to generate second write WRRO values. The second write WRRO values are used to write the first write WRRO values to the second track.
摘要翻译：公开了一种磁盘驱动器，其包括限定多个磁道的多个伺服扇区，以及包括从写入元件径向偏移的读取元件的磁头。读取元件位于第一轨道上，并且读取第一轨迹以产生第一读取楔形可重复跳动（WRRO）值。头部的第一寻找操作将读取的元素定位在第二个轨道上，并且读取第二个轨迹以产生第一个写入WRRO值。第一次写入WRRO值用于将第一个读取的WRRO值写入第一个轨道。磁头的第二次搜索操作将读取元件定位在第三磁道上，并且读取第三磁道以产生第二写WRRO值。第二次写入WRRO值用于将第一个写WRRO值写入第二个轨道。

3. 发明授权

US07339761B1 Method for wedge time shift calibration in a disk drive 有权
标题翻译：磁盘驱动器中楔形时移校准的方法
公开(公告)号：US07339761B1
公开(公告)日：2008-03-04
申请号：US11406090
申请日：2006-04-18
申请人： Kuang-Yang Tu , John Yin Kwong Li
发明人： Kuang-Yang Tu , John Yin Kwong Li
IPC分类号： G11B5/596 , G11B5/09
CPC分类号： G11B5/59616 , G11B5/5534
摘要： A method is disclosed for identifying wedge time shift zones on a magnetic disk of a disk drive. The disk drive further includes a spindle motor for rotating the disk at an operating speed in response to a spindle control current generated by a spindle control system, and a head that is actuated over the disk. During operation, the control systems causes a seek of the head across the disk and measures wedge-to-wedge times between servo wedges. The control system then calculates a wedge-to-wedge time shift value using the wedge-to-wedge times and determines whether the wedge-to-wedge time shift time value exceeds a predetermined threshold. If the wedge-to-wedge time shift value exceeds the predetermined threshold, then the control system identifies a wedge time shift zone, and stores information for compensating for the identified wedge time shift zone during disk operations.
摘要翻译：公开了一种用于识别磁盘驱动器的磁盘上的楔形时移区域的方法。磁盘驱动器还包括主轴电机，用于响应于由主轴控制系统产生的主轴控制电流而以操作速度旋转磁盘，以及在磁盘上启动的磁头。在操作过程中，控制系统会使磁头横跨磁盘进行搜索，并测量伺服楔块之间的楔形到楔形时间。然后，控制系统使用楔形到楔形时间来计算楔形到楔形的时间偏移值，并且确定楔形到楔形的时间偏移时间值是否超过预定的阈值。如果楔形到楔形时间偏移值超过预定阈值，则控制系统识别楔形时移区域，并且在盘操作期间存储用于补偿所识别的楔形时间移位区域的信息。

4. 发明授权

US06924959B1 Reducing estimation period for repeatable runout errors in a disk drive 失效
标题翻译：减少磁盘驱动器中可重复的跳动错误的估计周期
公开(公告)号：US06924959B1
公开(公告)日：2005-08-02
申请号：US10651408
申请日：2003-08-29
申请人： Hemant Melkote , Robert J. McNab , David D. Nguyen , John Yin Kwong Li
发明人： Hemant Melkote , Robert J. McNab , David D. Nguyen , John Yin Kwong Li
IPC分类号： G11B5/596
CPC分类号： G11B5/59627
摘要： A method for reducing an estimation period for repeatable runout (RRO) errors in a disk drive comprising a head, a disk surface having a track partitioned by servo-wedges, and a servo control system for controlling the movement of the head relative to a track during revolutions of the disk. The method includes estimating the RRO errors of the track based on a) a series of position error signal values obtained during a current revolution of the disk surface, and b) a previous estimation of the RRO errors of the track obtained during a previous revolution of the disk surface and determining a differential value between a first measure of the estimated RRO errors and a second measure of the previous estimation of RRO errors, and repeating the estimating and determining for subsequent revolutions of the disk surface until the determined differential value is smaller than a pre-selected threshold value.
摘要翻译：一种用于减少磁盘驱动器中可重复跳动（RRO）误差的估计周期的方法，包括磁头，具有由伺服楔形分隔的磁道的磁盘表面以及用于控制磁头相对于磁道的运动的伺服控制系统在盘的转动期间。该方法包括：基于a）在磁盘表面的当前旋转期间获得的一系列位置误差信号值来估计轨道的RRO误差，以及b）先前对先前转动期间获得的轨道的RRO误差的估计磁盘表面，并且确定估计的RRO误差的第一测量值与先前RRO误差估计的第二测量值之间的差值，并重复估计并确定盘表面的后续转数，直到所确定的微分值小于预先选择的阈值。

5. 发明授权

US07580212B1 Magnetic disk having efficiently stored WRRO compensation value redundancy information and method for using the redundancy information 失效
标题翻译：具有有效存储的WRRO补偿值冗余信息的磁盘和使用冗余信息的方法
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。

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