公开(公告)号：US06710953B1

公开(公告)日：2004-03-23

申请号：US09823738

申请日：2001-03-30

申请人： Mark F. Vallis ,  Ara W. Nazarian

发明人： Mark F. Vallis ,  Ara W. Nazarian

IPC分类号： G11B2736

CPC分类号： G11B27/36

摘要： A disk drive implements a technique for improving data storage capacity of data tracks having a servo wedge defect. A servo-fault position threshold is established for aborting a write operation if a transducer head position error from a circular track centerline exceeds the servo-fault position threshold. Servo wedges having operation, the servo-fault position threshold is ignored at a tagged servo wedge thereby preventing the tagged servo wedge from aborting a write operation. The data write operation is prevented for a predetermined number of servo wedges immediately following the tagged servo wedge by skipping data wedges between the tagged servo wedge and a last servo wedge of the predetermined number of servo wedges. Data may be written to a data wedge immediately following the last servo wedge.

摘要翻译： 磁盘驱动器实现用于改善具有伺服楔形缺陷的数据轨道的数据存储容量的技术。 如果来自圆形轨道中心线的传感器头位置误差超过伺服故障位置阈值，则建立伺服故障位置阈值以中止写入操作。 具有操作的伺服楔形件，在标记的伺服楔形件处忽略伺服故障位置阈值，从而防止标记的伺服楔块中止写入操作。 通过跳过标记的伺服楔和预定数量的伺服楔的最后一个伺服楔之间的数据楔，防止在标记的伺服楔之后的预定数量的伺服楔的数据写入操作。 数据可能会在最后一个伺服楔之后立即写入数据楔。

公开(公告)号：US06388829B1

公开(公告)日：2002-05-14

申请号：US09364744

申请日：1999-07-30

申请人： Ara W. Nazarian

发明人： Ara W. Nazarian

IPC分类号： G11B509

CPC分类号： G11B5/59655

摘要： A disk drive having multi-burst servo wedges and single-burst servo wedges for improving shock performance with less impact on data space than otherwise possible and a method of increasing the servo sampling rate for effecting reasonable shock detection in such a disk drive using such multi-burst and single-burst servo wedges. The additional single-burst servo wedges may contain certain desired servo wedge fields, or may consist of just the servo burst itself. In operation, the multi-burst and single servo wedges are processed in series. The multi-burst servo wedge is read to develop a position error signal and control the head, and the single-burst servo wedge is read, the single burst amplitude is compared to one of the plurality of burst amplitudes and, if the single burst amplitude differs by more than a predetermined threshold amount from the one previous burst amplitudes, the system aborts a data write operation.

摘要翻译： 具有多突发伺服楔形和单突发伺服楔形的磁盘驱动器，用于改善冲击性能，同时对数据空间的影响小于否则可能;以及一种增加伺服采样速率以便在这种磁盘驱动器中进行合理的冲击检测的方法， - 爆裂和单脉冲伺服楔。 附加的单脉冲串伺服楔可以包含某些所需的伺服楔场，或者可以仅由伺服脉冲本身构成。 在操作中，多脉冲串和单伺服楔形串联处理。 读取多脉冲串伺服楔以形成位置误差信号并控制磁头，读出单脉冲串伺服楔形，将单脉冲串幅度与多个脉冲串幅度中的一个进行比较，如果单脉冲串幅度 与前一个突发脉冲幅度相差大于预定阈值，系统中止数据写入操作。

公开(公告)号：US5946158A

公开(公告)日：1999-08-31

申请号：US893815

申请日：1997-07-11

申请人： Ara W. Nazarian ,  Thao P. Trieu ,  Richard K. Wong

发明人： Ara W. Nazarian ,  Thao P. Trieu ,  Richard K. Wong

IPC分类号： G11B5/55 ,  G11B5/596

CPC分类号： G11B5/59683 ,  G11B5/5534 ,  G11B5/59688

摘要： The invention is a method of calibrating a position error signal (PES) to overcome the problem of a measured displacement or PES that varies as a non-linear function of real displacement when the read transducer is positioned to either side of a null position where the PES equals zero. The PES is notably nonlinear while reading servo burst information with a Magneto-Resistive (MR) head which has nonlinear magnetic characteristics. The method uniquely calibrates the measured PES to provide a corrected PES without requiring any knowledge of the actual displacement from the position where the measured PES equals 0. The calibration according to this method, therefore, may be performed at anytime without need for real displacement information from a servowriter or any sort of special calibration track. The method involves positioning the MR head to a plurality of predetermined, measured displacements corresponding to partial track increments of real displacement of unknown magnitude on either side of the null position, measuring a PES gain value at each of the plurality of measured displacements, and then correcting subsequent measured displacements based on the plurality of measured displacements and corresponding PES gain values. The correcting step is preferably accomplished by using the measured displacements and corresponding PES gain values to establish coefficients of a correction function c(y) which substantially provides unity gain relative to real displacement over a limited range of measured displacements. The preferred correction function c(y) is a partial sum Fourier series.

摘要翻译： 本发明是一种校准位置误差信号（PES）的方法，以克服当读取换能器位于空位置的任一侧时作为实际位移的非线性函数而变化的测量位移或PES的问题，其中， PES等于零。 在具有非线性磁特性的磁阻（MR）磁头读取伺服脉冲串信息时，PES是非常非线性的。 该方法唯一地校准测量的PES以提供校正的PES，而不需要从测量的PES等于0的位置的实际位移的任何知识。因此，根据该方法的校准可以在任何时间执行而不需要实际位移信息 从伺服器或任何一种特殊的校准轨道。 该方法包括将MR头定位到对应于零位置的任一侧的未知幅度的实际位移的部分轨迹增量的多个预定的测量位移，测量多个测量位移中的每一个处的PES增益值，然后 基于多个测量位移和相应的PES增益值来校正随后的测量位移。 校正步骤优选地通过使用测量的位移和相应的PES增益值来实现，以建立校正函数c（y）的系数，其基本上在有限的测量位移范围内提供相对于实际位移的单位增益。 优选的校正函数c（y）是部分和傅里叶级数。