公开(公告)号：US09025269B1

公开(公告)日：2015-05-05

申请号：US14152129

申请日：2014-01-10

申请人： Western Digital Technologies, Inc.

发明人： Richard K. Wong ,  Sanghoon Chu ,  Guoxiao Guo ,  Jack M. Chue ,  Carl E. Barlow ,  Wei Guo ,  Michael Chang

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59688 ,  G11B5/59616

摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by full sectors and intervening short servo sectors, where each full servo sector comprises a preamble, a sync mark, and servo bursts, and each short servo sector comprises a reference pattern and servo bursts. A first phase error is generated based on the sync mark in a first full servo sector, and a disk locked clock is adjusted in response to the first phase error. A second phase error is generated based on the reference pattern in a first short servo sector, and the second phase error is processed to determine whether the disk locked clock slipped a cycle before the head reaching the first short servo sector.

摘要翻译： 公开了一种磁盘驱动器，其包括在盘上致动的磁头，该磁头包括由完整扇区和插入的短伺服扇区定义的多个伺服磁道，其中每个完整伺服扇区包括前同步码，同步标记和伺服脉冲串，以及每个短伺服扇区 包括参考图案和伺服脉冲串。 基于第一全伺服扇区中的同步标记产生第一相位误差，并且响应于第一相位误差来调整盘锁定时钟。 基于第一短伺服扇区中的参考模式产生第二相位误差，并且处理第二相位误差以确定磁头锁定时钟是否在磁头到达第一短伺服扇区之前滑动一个周期。

公开(公告)号：US09129630B1

公开(公告)日：2015-09-08

申请号：US14571521

申请日：2014-12-16

申请人： Western Digital Technologies, Inc.

发明人： Wei Guo ,  Michael Chang ,  Yuan Chen

IPC分类号： G11B5/54 ,  G11B5/596 ,  G11B5/49

CPC分类号： G11B5/59655 ,  G11B5/4969 ,  G11B5/59616

摘要： A data storage device is disclosed comprising a first head actuated over a first disk surface comprising servo tracks defined by full servo sectors, and a second head actuated over a second disk surface comprising servo tracks defined by mini servo sectors. At least part of a track address is read from one of the full servo sectors to generate at least one high order bit of a full track address, and at least part of a track address is read from one of the mini servo sectors to generate at least one low order bit of the full track address. The high order bit and the low order bit are combined to generate at least part of the full track address, and during an access of the second disk surface, the second head is servoed over the second disk surface based on the full track address.

摘要翻译： 公开了一种数据存储装置，其包括在包括由全伺服扇区限定的伺服轨道的第一盘表面上致动的第一头，以及在包括由微型伺服扇区限定的伺服轨道的第二盘表面上致动的第二头。 从全伺服扇区中的一个读取轨道地址的至少一部分，以产生全轨道地址的至少一个高位，并且从一个微型伺服扇区读取轨道地址的至少一部分，以在 整个轨道地址的至少一个低位位。 组合高阶位和低位位以产生全轨道地址的至少一部分，并且在第二盘表面的访问期间，基于完整轨道地址，第二磁头在第二磁盘表面上被伺服。

公开(公告)号：US08934186B1

公开(公告)日：2015-01-13

申请号：US14255647

申请日：2014-04-17

申请人： Western Digital Technologies, Inc.

发明人： Wei Guo ,  Michael Chang ,  Russ A. Quisenberry ,  Richard K. Wong ,  Guoxiao Guo

IPC分类号： G11B5/09

CPC分类号： G11B5/59688 ,  G11B5/59655

摘要： A data storage device is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones, and at least one servo sector of a servo track comprises a partial track address. A read signal generated by the head is processed to detect a current servo zone for the head, and the read signal is processed to detect the partial track address in one of the servo sectors of the current servo zone. A full track address is generated based on the detected servo zone and the detected partial track address.

摘要翻译： 公开了一种数据存储装置，包括在盘上致动的磁头，该磁头包括限定多个伺服磁道的多个伺服扇区。 伺服轨道形成多个伺服区，伺服轨道的至少一个伺服扇区包括部分轨道地址。 由头部产生的读取信号被处理以检测头部的当前伺服区域，并且处理读取信号以检测当前伺服区域的一个伺服扇区中的部分轨道地址。 基于检测到的伺服区域和检测到的部分轨道地址产生完整轨道地址。

公开(公告)号：US09454989B1

公开(公告)日：2016-09-27

申请号：US14644415

申请日：2015-03-11

申请人： Western Digital Technologies, Inc.

发明人： Michael Chang ,  Guoxiao Guo ,  Jie Yu

IPC分类号： G11B5/596 ,  G11B20/10 ,  G11B5/55 ,  G11B20/12 ,  G11B5/012

CPC分类号： G11B20/10222 ,  G11B5/012 ,  G11B5/5534 ,  G11B5/5543 ,  G11B5/556 ,  G11B5/5586 ,  G11B5/596 ,  G11B5/59622 ,  G11B5/59655 ,  G11B5/59688 ,  G11B20/10046 ,  G11B20/1217 ,  G11B2020/1232 ,  G11B2020/1242 ,  G11B2020/1281

摘要： A disk drive is disclosed comprising a disk comprising a plurality of servo sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones, where a servo data rate of servo sectors in a first servo zone is different than a servo data rate of servo sectors in a second servo zone. A servo control system servos a head over the disk. An estimated servo state of a servo control system is generated, and when the head crosses from a first servo zone to a second servo zone, the estimated servo state is adjusted to compensate for a transient in a circumferential distance between a servo sector in the first servo zone and a servo sector in the second servo zone.

公开(公告)号：US09053712B1

公开(公告)日：2015-06-09

申请号：US14271770

申请日：2014-05-07

申请人： Western Digital Technologies, Inc.

发明人： Guoxiao Guo ,  Russ A. Quisenberry ,  Wei Guo ,  Michael Chang ,  Jie Yu

IPC分类号： G11B21/02 ,  G11B5/09

CPC分类号： G11B5/012 ,  G11B5/02 ,  G11B5/4886 ,  G11B5/59644

摘要： A data storage device is disclosed comprising a disk surface comprising a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The data storage device further comprises a head actuated over the disk surface, the head comprising at least one read element and at least one write element. Control circuitry is configured to use the head to write to a first data sector on the disk surface while simultaneously reading from a first servo sector on the disk surface.

摘要翻译： 公开了一种数据存储装置，其包括包括多个轨道的盘表面，其中每个轨道包括多个数据扇区和多个伺服扇区。 数据存储装置还包括在磁盘表面上致动的磁头，磁头包括至少一个读取元件和至少一个写入元件。 控制电路被配置为使用磁头写入磁盘表面上的第一数据扇区，同时从盘表面上的第一伺服扇区读取。

公开(公告)号：US08982503B1

公开(公告)日：2015-03-17

申请号：US13746230

申请日：2013-01-21

申请人： Western Digital Technologies, Inc.

发明人： Michael Chang

IPC分类号： G11B21/02 ,  G11B21/08

CPC分类号： G11B5/59627

摘要： A disk drive is disclosed comprising a disk comprising tracks defined by servo sectors, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk in response to the servo sectors. After seeking the head to a first track, a position error signal (PES) is generated representing a difference between a target location for the head and a measured location for the head. A sinusoidal control signal is generated in response to the servo sectors, and a third point of the sinusoidal control signal is generated based on a first point and second point of the sinusoidal control signal and independent of the PES, wherein the first, second and third points correspond to respective servo sectors. A feed-forward compensation value is generated based on the third point of the sinusoidal control signal using a feed-forward compensator.

摘要翻译： 公开了一种磁盘驱动器，包括包括由伺服扇区定义的磁道的磁盘，磁头和包括伺服控制系统的控制电路，所述伺服控制系统可操作以响应于伺服扇区致动磁头。 在将头部寻求到第一轨道之后，产生位置误差信号（PES），表示头部的目标位置与头部的测量位置之间的差异。 响应于伺服扇区产生正弦控制信号，并且基于正弦控制信号的第一点和第二点并且独立于PES产生正弦控制信号的第三点，其中第一，第二和第三 点对应于各个伺服扇区。 使用前馈补偿器，基于正弦控制信号的第三点产生前馈补偿值。

公开(公告)号：US09153263B1

公开(公告)日：2015-10-06

申请号：US14152737

申请日：2014-01-10

申请人： Western Digital Technologies, Inc.

发明人： Michael Chang ,  Wei Guo ,  Russ A. Quisenberry ,  Guoxiao Guo

IPC分类号： G11B5/596 ,  G11B20/12 ,  G11B20/10

CPC分类号： G11B5/59633 ,  G11B5/59616 ,  G11B5/59644 ,  G11B2020/10916 ,  G11B2020/1267

摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks defined by servo sectors forming a plurality of full wedges and a plurality of mini wedges. The wedge ID field of a servo sector forming one of the full wedges is offset from a beginning of a sync mark by a first offset, and the wedge ID field of a servo sector forming one of the mini wedges is offset from the beginning of the sync mark by a second offset equal to the first offset. A first servo sector is read from the disk to generate a read signal, the read signal is demodulated to detect the wedge ID of the first servo sector, and the detected wedge ID is evaluated to determine whether the first servo sector forms one of the mini wedges.

摘要翻译： 公开了一种磁盘驱动器，其包括在盘上致动的磁头，磁头包括由伺服扇区限定的多个磁道，形成多个完整的楔块和多个微型楔块。 形成整个楔块之一的伺服扇区的楔形ID字段从同步标记的开始偏移第一偏移，并且形成微型楔块之一的伺服扇区的楔形ID字段偏离 同步标记以等于第一个偏移量的第二个偏移量。 从盘读取第一伺服扇区以产生读取信号，解调读取信号以检测第一伺服扇区的楔形ID，并且评估检测到的楔ID，以确定第一伺服扇区是否形成微型 楔子

公开(公告)号：US08941945B1

公开(公告)日：2015-01-27

申请号：US14298734

申请日：2014-06-06

申请人： Western Digital Technologies, Inc.

发明人： Michael Chang ,  Wei Guo ,  Yun Hong ,  Brian P. Rigney ,  Guoxiao Guo

IPC分类号： G11B21/02

CPC分类号： G11B5/59633

摘要： A data storage device is disclosed comprising a first disk surface comprising servo tracks defined by servo sectors and recorded at a first radial density, and a first head actuated over the first disk surface. A servo sector on the first disk surface is read to generate a first physical position measurement that is converted into a first virtual position measurement corresponding to a nominal radial density of servo tracks different from the first radial density. The first head is servoed over the first disk surface based on the first virtual position measurement.

摘要翻译： 公开了一种数据存储装置，其包括第一盘表面，其包括由伺服扇区限定并以第一径向密度记录的伺服轨迹，以及在第一盘表面上致动的第一头。 读取第一磁盘表面上的伺服扇区以产生第一物理位置测量值，该第一物理位置测量值被转换成对应于不同于第一径向密度的伺服磁道的标称径向密度的第一虚拟位置测量。 基于第一虚拟位置测量，第一磁头在第一磁盘表面上被伺服。