公开(公告)号：US06927929B2

公开(公告)日：2005-08-09

申请号：US10670493

申请日：2003-09-24

申请人： Karl Gong ,  Hal Hjalmar Ottesen ,  Gordon James Smith

发明人： Karl Gong ,  Hal Hjalmar Ottesen ,  Gordon James Smith

IPC分类号： G11B5/596 ,  G11B27/36

CPC分类号： G11B27/36 ,  G11B5/59611 ,  G11B5/59627 ,  G11B2220/20

摘要： A position error signal amplitude indicative of the distance between an expected position of a magnetic head relative to the track centerline of a magnetic data storage and retrieval system and an actual position of the magnetic head relative to the track centerline is detected and filtered. The signal is filtered to generate a sway mode signal amplitude indicative of an oscillation of the actual position of the magnetic head relative to the track centerline in the frequency range of the filter. The absolute value of the sway mode signal amplitude is then determined. If the absolute value of the sway mode signal exceeds a predetermined threshold value that correlates to a high probability of impending a head-disk crash, a warning signal is propagated. Alternative embodiments similarly predict the possibility of head-disk crash on the basis of the maximum value of several samples of the position error signal and on the basis of the maximum value of several samples of the square of the position error signal amplitude

摘要翻译： 检测并过滤表示磁头相对于磁数据存储和检索系统的轨道中心线的预期位置与磁头相对于轨道中心线的实际位置之间的距离的位置误差信号幅度。 信号被滤波以产生指示在滤波器的频率范围内磁头相对于轨道中心线的实际位置的振荡的摆动模式信号幅度。 然后确定摇摆模式信号幅度的绝对值。 如果摇摆模式信号的绝对值超过与头盘碰撞的高概率相关的预定阈值，则传播报警信号。 替代实施例类似地基于位置误差信号的几个样本的最大值并且基于位置误差信号幅度的平方的几个样本的最大值来预测头盘碰撞的可能性

公开(公告)号：US06603630B1

公开(公告)日：2003-08-05

申请号：US09473838

申请日：1999-12-28

申请人： Karl Gong ,  Bernd Lamberts ,  Thomas Earl Stanley

发明人： Karl Gong ,  Bernd Lamberts ,  Thomas Earl Stanley

IPC分类号： G11B5596

CPC分类号： G11B5/596

摘要： A method and apparatus for monitoring track misregistration that is quicker and that is not limited to worst case assumptions. The present invention includes a first memory for accumulating position error signals for a head to produce an accumulated value, a processor for normalizing the accumulated value to produce a normalized result at a predetermined trigger event and a second memory for adding the normalized result therein to produce a running sum; wherein the head is positioned using the running sum. The processor resets the first memory when the normalized result is produced. A counter is provided for incrementing a count value after each position error signal is added to the first memory. The processor normalizes the accumulated value according to the count value of the counter, and the processor resets the counter as a result. In addition, the processor may normalize the accumulated value according to a population mean and a variance associated with the data storage system. The trigger event may include the accumulated error value reaching a predetermined threshold or a servo seek to the next track. The process may be initiated using a self-test command.

摘要翻译： 用于监测轨迹重合失调的方法和装置，该方法和装置更快，并不限于最坏的情况假定。 本发明包括一个第一存储器，用于累积头部的位置误差信号以产生累加值;处理器，用于对累积值进行归一化以在预定的触发事件处产生归一化结果;以及第二存储器，用于将归一化结果加到其中以产生 一个运行的和; 其中使用运行总和来定位头部。 当生成标准化结果时，处理器重置第一个内存。 提供计数器用于在将每个位置误差信号添加到第一存储器之后递增计数值。 处理器根据计数器的计数值对积分值进行归一化，结果，处理器重置计数器。 此外，处理器可以根据总体平均值和与数据存储系统相关联的方差来对累积值进行归一化。 触发事件可以包括达到预定阈值的累积误差值或到下一个轨道的伺服寻找。 该过程可以使用自检命令来启动。

公开(公告)号：US06683737B2

公开(公告)日：2004-01-27

申请号：US09909294

申请日：2001-07-19

申请人： Karl Gong ,  Hal Hjalmar Ottesen ,  Gordon James Smith

发明人： Karl Gong ,  Hal Hjalmar Ottesen ,  Gordon James Smith

IPC分类号： G11B2736

CPC分类号： G11B27/36 ,  G11B5/59611 ,  G11B5/59627 ,  G11B2220/20

摘要： A position error signal indicative of the distance between an expected position of a magnetic head relative to the track centerline of a magnetic data storage and retrieval system and an actual position of the magnetic head relative to the track centerline is detected. An absolute value of the position error signal is determined and stored. The detection, determination, and storage is repeated over several revolutions of the magnetic data storage and retrieval system. A maximum of the absolute values of the position error signals is then determined and compared to a threshold value. If the maximum of the absolute values of the position error signals exceeds the threshold value, a warning signal is propagated. An alternative embodiment similarly predicts the possibility of head-disk crash on the basis of the maximum value of several samples of the squares of the position error signals.

摘要翻译： 检测指示磁头相对于磁数据存储和检索系统的轨道中心线的预期位置与磁头相对于轨道中心线的实际位置之间的距离的位置误差信号。 确定并存储位置误差信号的绝对值。 在磁数据存储和检索系统的几圈内重复检测，确定和存储。 然后确定位置误差信号的绝对值的最大值并将其与阈值进行比较。 如果位置误差信号的绝对值的最大值超过阈值，则传播警告信号。 替代实施例类似地基于位置误差信号的平方的几个样本的最大值来预测头盘碰撞的可能性。

公开(公告)号：US6118609A

公开(公告)日：2000-09-12

申请号：US102733

申请日：1998-06-22

申请人： Karl Gong

发明人： Karl Gong

IPC分类号： G11B5/54 ,  G11B5/55 ,  G11B15/12

CPC分类号： G11B5/5521 ,  G11B5/54

摘要： A disk drive having an improved method of adjusting the head switch time to improve disk drive performance. In the process of writing or reading long data files, the heads on the actuator are sequentially selected in order to access all the data tracks forming a cylinder in the shortest time. Head offsets are significantly smaller for switching between heads mounted on the same actuator arm than for switching between heads mounted on different actuator arms. Therefore improved disk drive performance is obtained by using two values of head switch time instead of one. The head switch time allocated for switching from a first head on one actuator arm to a second head on a second actuator arm is made longer than the head switch time allocated for switching from a first head on one actuator arm to a second head on the same actuator arm. By allocating longer time for the head switches between different actuator arms, the error flag rate for heads not ready is reduced. The average head switch time is reduced without increasing error rates by separately optimizing the head switch times for same actuator arm head switches and different actuator arm head switches.

摘要翻译： 磁盘驱动器具有改进的方法来调节磁头开关时间以提高磁盘驱动器的性能。 在写入或读取长数据文件的过程中，依次选择致动器上的磁头，以便在最短的时间内访问形成汽缸的所有数据轨道。 在安装在同一个执行机构臂上的磁头之间的磁头偏移量要小于安装在不同执行机构臂上的磁头之间的切换。 因此，通过使用头开关时间的两个值而不是一个来获得改进的磁盘驱动器性能。 分配用于从一个致动器臂上的第一头切换到第二致动器臂上的第二头的头切换时间比分配用于从一个致动器臂上的第一头切换到相同的第二头上的头切换时间长 执行器臂。 通过为不同的执行器臂之间的磁头开关分配更长的时间，磁头未就绪的误差标志速率降低。 通过单独优化相同的执行器臂头开关和不同的执行器臂头开关的头开关时间，平均头切换时间减少，而不会增加错误率。

公开(公告)号：US5328270A

公开(公告)日：1994-07-12

申请号：US38579

申请日：1993-03-25

申请人： Roy P. Crawford ,  Mats Engwall ,  Larry J. Gilliland ,  Karl Gong ,  Michel P. Robert

发明人： Roy P. Crawford ,  Mats Engwall ,  Larry J. Gilliland ,  Karl Gong ,  Michel P. Robert

IPC分类号： F16C32/06 ,  F04D19/04 ,  F16C17/02 ,  F16C33/10 ,  G11B19/20

CPC分类号： F16C33/106 ,  F16C17/026 ,  F16C33/107 ,  G11B19/2009 ,  F16C2370/12

摘要： An integrated bearing and pump assembly is formed by positioning a hydrodynamic pump coaxially with respect to a hydrodynamic bearing. The integrated assembly provides pressurized fluid for use within the device incorporating the bearing. The hydrodynamic pump comprises a secondary hydrodynamic bearing incorporated into the primary bearing assembly. The secondary bearing is optimized for high flow pumping applications rather than the high pressure, zero flow requirements of the primary bearing. When the bearing assembly is rotated, fluid flow is provided.

摘要翻译： 通过相对于流体动力轴承同轴地定位流体动力泵来形成集成的轴承和泵组件。 集成组件提供加压流体，以在包含轴承的装置内使用。 流体动力泵包括结合到主轴承组件中的次级流体动力轴承。 次级轴承针对高流量泵送应用进行了优化，而不是主轴承的高压，零流量要求。 当轴承组件旋转时，提供流体流动。