公开(公告)号：US08665546B1

公开(公告)日：2014-03-04

申请号：US12684045

申请日：2010-01-07

申请人： Hongchao Tim Zhao ,  Jiangang Liang ,  Yilin Cai ,  Don Brunnett

发明人： Hongchao Tim Zhao ,  Jiangang Liang ,  Yilin Cai ,  Don Brunnett

IPC分类号： G11B21/02

CPC分类号： G11B5/6076 ,  G11B5/607

摘要： A disk drive is disclosed comprising a disk, a head for writing data to the disk, and control circuitry coupled to the head. The control circuitry is operable to determine a first set of fly height values and determine a threshold based on the first set of fly height values. The control circuitry determines a second set of fly height values, adjusts the threshold based on the second set of fly height values, and detects a head characteristic based on the adjusted threshold. The head characteristic is detected by detecting a head touchdown event and/or detecting contamination related to the head based on the adjusted threshold.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，用于将数据写入盘的头和耦合到头的控制电路。 控制电路可操作以确定第一组飞行高度值，并基于第一组飞行高度值确定阈值。 控制电路确定第二组飞行高度值，基于第二组飞行高度值来调整阈值，并且基于经调整的阈值检测头部特性。 通过基于经调整的阈值检测头部触地事件和/或检测与头部相关的污染物来检测头部特性。

公开(公告)号：US08537486B2

公开(公告)日：2013-09-17

申请号：US13207332

申请日：2011-08-10

申请人： Jiangang Liang ,  Siri S. Weerasooriya ,  Yun Hong ,  Yilin Cai

发明人： Jiangang Liang ,  Siri S. Weerasooriya ,  Yun Hong ,  Yilin Cai

IPC分类号： G11B5/02

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

摘要： A method is disclosed of servo writing a disk drive comprising a first head actuated over a first disk surface, and a second head actuated over a second disk surface. A first repeatable runout (RRO) of the first disk surface is measured, and a seek is performed to seek the first head over the first disk surface in response to the measured first RRO while writing a first spiral track to the second disk surface using the second head. As a result, the first spiral track comprises a second RRO that substantially matches the first RRO of the first disk surface.

摘要翻译： 公开了一种伺服写入磁盘驱动器的方法，所述磁盘驱动器包括在第一磁盘表面上致动的第一磁头和在第二磁盘表面上致动的第二磁头。 测量第一磁盘表面的第一可重复跳动（RRO），并且执行搜索以响应于测量的第一RRO在第一磁盘表面上寻找第一磁头，同时使用第一磁盘表面向第二磁盘表面写入第一螺旋磁道 第二个头。 结果，第一螺旋轨道包括与第一盘表面的第一RRO基本匹配的第二RRO。

公开(公告)号：US07852592B1

公开(公告)日：2010-12-14

申请号：US12021976

申请日：2008-01-29

申请人： Jiangang Liang ,  Charles A. Park ,  Yilin Cai ,  Siri S. Weerasooriya

发明人： Jiangang Liang ,  Charles A. Park ,  Yilin Cai ,  Siri S. Weerasooriya

IPC分类号： G11B21/02

CPC分类号： G11B5/59627 ,  G11B5/59633 ,  G11B5/59661 ,  G11B19/045

摘要： A disk drive that approximates spiral slope in spiral patterns is disclosed. The disk drive includes a disk having at least one spiral pattern that extends radially across the disk, a head to read a portion of the at least one spiral pattern, and a processor to approximate a spiral slope of the portion of the at least one spiral pattern. The processor approximates the spiral slope of the portion of the at least one spiral pattern by implementing operations including: reading amplitude values for the portion of the at least one spiral pattern; determining an amplitude value distribution based on the amplitude values; determining a curve-fitted function for the amplitude value distribution; and determining an approximate spiral slope based on the curve-fitted function.

摘要翻译： 公开了以螺旋图案近似螺旋斜率的磁盘驱动器。 磁盘驱动器包括具有径向延伸穿过磁盘的至少一个螺旋图案的磁盘，用于读取至少一个螺旋图案的一部分的磁头，以及处理器，用于近似该至少一个螺旋部分的螺旋斜面 模式。 处理器通过实现以下操作来近似该至少一个螺旋图案的部分的螺旋斜率：包括：读取该至少一个螺旋图案的该部分的振幅值; 基于振幅值确定振幅值分布; 确定振幅值分布的曲线拟合函数; 并基于曲线拟合函数确定近似螺旋斜率。

公开(公告)号：US08670206B1

公开(公告)日：2014-03-11

申请号：US13431691

申请日：2012-03-27

申请人： Jiangang Liang ,  Siri S. Weerasooriya ,  Yilin Cai

发明人： Jiangang Liang ,  Siri S. Weerasooriya ,  Yilin Cai

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A disk drive is disclosed comprising head actuated over a disk comprising a reference pattern. The head is positioned at a first radial location, a first phase error is measured in response to the reference pattern at the first radial location, and a first repeatable runout (RRO) of the first phase error is measured. The head is positioned at a second radial location, a second phase error is measured in response to the reference pattern at the second radial location, and a second repeatable runout (RRO) of the second phase error is measured. The first and second RROs are processed to estimate an offset r0 representing a difference between an axial rotation of the disk and an axial rotation of the reference pattern.

摘要翻译： 公开了一种磁盘驱动器，其包括在包括参考图案的盘上致动的磁头。 头部位于第一径向位置处，响应于第一径向位置处的参考图案测量第一相位误差，并且测量第一相位误差的第一可重复跳动（RRO）。 头部位于第二径向位置处，响应于第二径向位置处的参考图案测量第二相位误差，并且测量第二相位误差的第二可重复跳动（RRO）。 处理第一和第二RRO以估计表示盘的轴向旋转和参考图案的轴向旋转之间的差异的偏移r​​0。

公开(公告)号：US07333280B1

公开(公告)日：2008-02-19

申请号：US10911039

申请日：2004-08-03

申请人： Yakov M. Lifchits ,  Wing Ying ,  Yilin Cai ,  Siri S. Weerasooriya

发明人： Yakov M. Lifchits ,  Wing Ying ,  Yilin Cai ,  Siri S. Weerasooriya

IPC分类号： G11B21/02

CPC分类号： G11B5/596 ,  G11B5/59666

摘要： A method of writing product servo sectors on a disk of a disk drive is disclosed. The disk comprises a reference pattern having a plurality of sync marks written around the disk. The sync marks are detected to generate a sync mark detect signal, and a timing recovery measurement is generated in response to the sync mark detect signal. A frequency control signal is generated in response to the timing recovery measurement, and a servo write clock is generated in response to the frequency control signal. A feed-forward compensation value is generated in response to the timing recovery measurement and the frequency control signal, and the timing recovery measurement is adjusted in response to the feed-forward compensation value to compensate for a repeatable phase error in the timing recovery measurement. The servo write clock and the head internal to the disk drive are used to write the product servo sectors to the disk.

摘要翻译： 公开了一种在盘驱动器的盘上写入产品伺服扇区的方法。 磁盘包括具有围绕磁盘写入的多个同步标记的参考图案。 检测同步标记以产生同步标记检测信号，并且响应于同步标记检测信号产生定时恢复测量。 响应于定时恢复测量而产生频率控制信号，并且响应于频率控制信号产生伺服写入时钟。 响应于定时恢复测量和频率控制信号产生前馈补偿值，并且响应于前馈补偿值来调整定时恢复测量以补偿定时恢复测量中的可重复的相位误差。 伺服写入时钟和磁盘驱动器内部的磁头用于将产品伺服扇区写入磁盘。

公开(公告)号：US20110216431A1

公开(公告)日：2011-09-08

申请号：US12718920

申请日：2010-03-05

申请人： Dhanakorn Iamratanakul ,  Thomas A. O'Dell ,  Yilin Cai

发明人： Dhanakorn Iamratanakul ,  Thomas A. O'Dell ,  Yilin Cai

IPC分类号： G11B27/36

CPC分类号： G11B27/36

摘要： A method of processing disks on spin stand is disclosed, the spin stand comprising a spindle motor having a rotor. A first disk is clamped to the rotor, wherein the first disk comprises a reference servo pattern. A second disk is clamped to the rotor, and a first head is servoed over the first disk in response to the reference servo pattern in order to position a second head over the second disk at a first radial location. Data is written to the second disk at the first radial location using the second head. The second disk is removed from the rotor while the first disk remains clamped to the rotor.

摘要翻译： 公开了一种在旋转架上处理圆盘的方法，该旋转台包括具有转子的主轴马达。 第一盘被夹紧到转子上，其中第一盘包括参考伺服模式。 第二盘被夹紧到转子，并且第一头被响应于参考伺服模式而被伺服在第一盘上，以便在第一径向位置将第二头定位在第二盘上。 使用第二头将数据在第一径向位置写入第二盘。 当第一盘保持夹紧到转子时，第二盘从转子上移除。

公开(公告)号：US07391584B1

公开(公告)日：2008-06-24

申请号：US11593929

申请日：2006-11-07

申请人： Edgar D. Sheh ,  Yilin Cai

发明人： Edgar D. Sheh ,  Yilin Cai

IPC分类号： G11B5/09 ,  G11B21/02

CPC分类号： G11B5/59627 ,  G11B5/59644 ,  G11B5/59661 ,  G11B20/10037 ,  G11B20/10222 ,  G11B20/1403 ,  G11B2020/1282 ,  G11B2020/1287

摘要： A method of servo writing a disk of a disk drive is disclosed. The disk comprises a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted periodically by a sync mark. A timing recovery measurement is generated in response to the sync marks, wherein the timing recovery measurement comprises a sinusoidal component. A timing compensation value is generated in response to the sync marks which estimates the sinusoidal component in the timing recovery measurement. A frequency control signal is generated in response to the timing recovery measurement and the timing compensation value, a servo write clock is generated in response to the frequency control signal, and the servo write clock and the head internal to the disk drive are used to write the product servo sectors to the disk.

摘要翻译： 公开了一种伺服写磁盘驱动器盘的方法。 盘包括多个螺旋轨道，其中每个螺旋轨道包括由同步标记周期性地中断的高频信号。 响应于同步标记产生定时恢复测量，其中定时恢复测量包括正弦分量。 响应于在定时恢复测量中估计正弦分量的同步标记产生定时补偿值。 响应于定时恢复测量和定时补偿值产生频率控制信号，响应于频率控制信号产生伺服写入时钟，并且使用伺服写入时钟和磁盘驱动器内部的磁头写入 产品伺服扇区到磁盘。

公开(公告)号：US08218260B2

公开(公告)日：2012-07-10

申请号：US12718920

申请日：2010-03-05

申请人： Dhanakorn Iamratanakul ,  Thomas A O'Dell ,  Yilin Cai

发明人： Dhanakorn Iamratanakul ,  Thomas A O'Dell ,  Yilin Cai

IPC分类号： G11B21/02 ,  G11B17/038

CPC分类号： G11B27/36

摘要： A method of processing disks on spin stand is disclosed, the spin stand comprising a spindle motor having a rotor. A first disk is clamped to the rotor, wherein the first disk comprises a reference servo pattern. A second disk is clamped to the rotor, and a first head is servoed over the first disk in response to the reference servo pattern in order to position a second head over the second disk at a first radial location. Data is written to the second disk at the first radial location using the second head. The second disk is removed from the rotor while the first disk remains clamped to the rotor.

摘要翻译： 公开了一种在旋转架上处理圆盘的方法，该旋转台包括具有转子的主轴马达。 第一盘被夹紧到转子上，其中第一盘包括参考伺服模式。 第二盘被夹紧到转子上，并且第一头被响应于参考伺服模式而被伺服在第一盘上，以便在第一径向位置将第二头定位在第二盘上。 使用第二头将数据在第一径向位置写入第二盘。 当第一盘保持夹紧到转子时，第二盘从转子上移除。