公开(公告)号：US08654467B1

公开(公告)日：2014-02-18

申请号：US13448023

申请日：2012-04-16

申请人： Wai Ee Wong ,  Xiaotian Xu ,  Jinchuan Zheng ,  Guoxiao Guo ,  Jie Yu

发明人： Wai Ee Wong ,  Xiaotian Xu ,  Jinchuan Zheng ,  Guoxiao Guo ,  Jie Yu

IPC分类号： G11B27/36

CPC分类号： G11B20/10472 ,  G11B5/09 ,  G11B5/59622 ,  G11B5/6029 ,  G11B20/10046

摘要： A disk drive is disclosed comprising a disk including a plurality of servo tracks defined by servo sectors, wherein each servo sector comprises a servo preamble. A head is actuated over the disk, wherein the head is operable to generate a read signal. The disk drive further comprises control circuitry including an analog cutoff filter operable to filter the read signal to generate a filtered read signal. The filtered read signal is sampled to generate read samples. During a normal operating mode, the analog cutoff filter is configured to have a first bandwidth. During a measurement mode, the analog cutoff filter is configured to have a second bandwidth greater than the first bandwidth, and the read samples representing at least part of the servo preamble are processed to measure a signal-to-noise ratio (SNR) and/or a fly height of the head.

摘要翻译： 公开了一种磁盘驱动器，其包括包括由伺服扇区定义的多个伺服磁道的磁盘，其中每个伺服扇区包括伺服前导码。 头部被驱动在盘上，其中头部可操作以产生读取信号。 磁盘驱动器还包括控制电路，其包括模拟截止滤波器，其可操作以对读取信号进行滤波以产生经滤波的读取信号。 对经滤波的读取信号进行采样以产生读取样本。 在正常操作模式期间，模拟截止滤波器被配置为具有第一带宽。 在测量模式期间，模拟截止滤波器被配置为具有大于第一带宽的第二带宽，并且处理表示伺服前导码的至少一部分的读取样本以测量信噪比（SNR）和/ 或头部的飞高。

公开(公告)号：US07518819B1

公开(公告)日：2009-04-14

申请号：US11849029

申请日：2007-08-31

申请人： Jie Yu ,  Guoxiao Guo ,  Jack M. Chue

发明人： Jie Yu ,  Guoxiao Guo ,  Jack M. Chue

IPC分类号： G11B21/02 ,  G11B27/36

CPC分类号： G11B5/59633 ,  G11B5/59627 ,  G11B5/59666 ,  G11B5/59672 ,  G11B20/1258 ,  G11B20/18 ,  G11B2020/1281 ,  G11B2220/2516

摘要： A disk drive is disclosed comprising a disk having a plurality of tracks, wherein each track comprises a plurality of data sectors and a plurality of servo sectors. The disk drive further comprises a head actuated over the disk, the head comprising a read element radially offset from a write element by a reader/writer offset. In order to rewrite a marginal servo sector detected in a target track, control circuitry within the disk drive relocates user data recorded in a first data sector of a near adjacent track to a staging memory. Servo data is written over the first data sector, and the read element is used to read the servo data written over the first data sector to actuate the head to rewrite the marginal servo sector of the target track. The user data stored in the staging memory is then rewritten to the first data sector.

摘要翻译： 公开了一种磁盘驱动器，其包括具有多个磁道的磁盘，其中每个磁道包括多个数据扇区和多个伺服扇区。 磁盘驱动器还包括在磁盘上致动的磁头，磁头包括读/写偏移量从写入元件径向偏移的读取元件。 为了重写在目标轨道中检测到的边缘伺服扇区，磁盘驱动器内的控制电路将记录在邻近轨道的第一数据扇区中的用户数据重新定位到分段存储器。 将伺服数据写入第一数据扇区，读取元件用于读取通过第一数据扇区写入的伺服数据，以驱动磁头来重写目标磁道的边缘伺服扇区。 存储在分段存储器中的用户数据然后被重写到第一数据扇区。

公开(公告)号：US07800853B1

公开(公告)日：2010-09-21

申请号：US12327560

申请日：2008-12-03

申请人： Guoxiao Guo ,  Jie Yu

发明人： Guoxiao Guo ,  Jie Yu

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B5/59633

摘要： A disk drive is disclosed comprising a disk having a plurality of data tracks defined by a plurality of servo sectors, wherein each servo sector comprises a Gray coded address representing at least part of a track address. The disk drive further comprises a head actuated over the disk for detecting a first Gray coded address in a first servo sector. A second Gray coded address is generated in response to the first Gray coded address. The first Gray coded address is decoded into a first binary address, and the second Gray coded address is decoded into a second binary address. One of the first and second binary addresses closest to a target address is selected, and the head is positioned in response to the selected binary address.

摘要翻译： 公开了一种磁盘驱动器，其包括具有由多个伺服扇区定义的多个数据磁道的磁盘，其中每个伺服扇区包括表示轨道地址的至少一部分的格雷编码地址。 磁盘驱动器还包括在磁盘上致动的磁头，用于检测第一伺服扇区中的第一灰度编码地址。 响应于第一个灰色编码地址生成第二个灰色编码地址。 第一格雷编码地址被解码为第一二进制地址，第二格雷编码地址被解码成第二二进制地址。 选择与目标地址最接近的第一和第二二进制地址之一，并且响应于所选择的二进制地址来定位头。

公开(公告)号：US07639447B1

公开(公告)日：2009-12-29

申请号：US12032911

申请日：2008-02-18

申请人： Jie Yu ,  Guoxiao Guo

发明人： Jie Yu ,  Guoxiao Guo

IPC分类号： G11B5/596

CPC分类号： G11B5/59627 ,  G11B19/045

摘要： A disk drive that compensates for written-in track squeeze errors (TSEs) during track following is disclosed. The disk drive may be used to compensate for TSEs when determining the position error signal (PES) by implementing operations that include: determining a track squeeze value for a servo sector based upon read servo bursts; determining a PES value for the servo sector based upon read servo bursts; estimating a Squeeze Correction Coefficient (SCC) to account for track squeeze induced PES sensing gain variation associated with the servo sector based upon the PES value and the track squeeze value; calculating a squeeze corrected PES value based upon the SCC and the PES value; and utilizing the squeeze corrected PES value in servo control.

摘要翻译： 公布了在跟踪跟踪期间补偿写入轨道挤压错误（TSE）的磁盘驱动器。 当通过实施包括以下操作来确定位置误差信号（PES）来确定磁盘驱动器时，磁盘驱动器可用于补偿TSE：包括：基于读取的伺服脉冲确定伺服扇区的磁道挤压值; 基于读取的伺服脉冲串确定伺服扇区的PES值; 基于PES值和轨道挤压值，估计挤压校正系数（SCC）以考虑与伺服扇区相关联的轨道挤压感应PES感测增益变化; 基于SCC和PES值计算挤压修正的PES值; 并在伺服控制中利用挤压修正的PES值。

公开(公告)号：US08995075B1

公开(公告)日：2015-03-31

申请号：US13529958

申请日：2012-06-21

申请人： Michael Chang ,  Guoxiao Guo ,  Jie Yu

发明人： Michael Chang ,  Guoxiao Guo ,  Jie Yu

IPC分类号： G11B5/012 ,  G11B5/09 ,  G11B5/55

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.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，该盘包括限定多个伺服轨道的多个伺服扇区。 伺服轨道形成多个伺服区，其中第一伺服区中的伺服扇区的伺服数据速率与第二伺服区中的伺服扇区的伺服数据速率不同。 伺服控制系统通过磁盘驱动头。 产生伺服控制系统的估计伺服状态，并且当磁头从第一伺服区与第二伺服区交叉时，调整估计的伺服状态以补偿第一伺服区中的伺服扇区之间的圆周距离内的瞬态 伺服区和第二伺服区中的伺服扇区。

公开(公告)号：US08711506B1

公开(公告)日：2014-04-29

申请号：US13485373

申请日：2012-05-31

申请人： Davide Giovenzana ,  John W. Vanlaanen ,  Prakash Balasubramaniam ,  Teik Ee Yeo ,  Guoxiao Guo ,  Honge Wang ,  Jie Yu ,  Philip S. Gordon

发明人： Davide Giovenzana ,  John W. Vanlaanen ,  Prakash Balasubramaniam ,  Teik Ee Yeo ,  Guoxiao Guo ,  Honge Wang ,  Jie Yu ,  Philip S. Gordon

IPC分类号： G11B5/09

CPC分类号： G11B5/5547 ,  G11B5/4886

摘要： A disk drive is disclosed comprising a disk comprising a plurality of servo tracks defined by servo sectors. The disk drive further comprises a head comprising a read element offset linearly from a write element by a gap such that when the disk rotates, the read element reaches a servo sector before the write element. During a first operation, a first length of a beginning of the servo sector is read, and during a write operation, a second length of the beginning of the servo sector shorter than the first length is read to enable data to be written while the read element is over at least part of the servo sector.

摘要翻译： 公开了一种盘驱动器，其包括由伺服扇区限定的多个伺服轨道的盘。 磁盘驱动器还包括一个磁头，其包括一个读取元件，该读取元件通过间隙与写入元件线性偏移，使得当磁盘旋转时，读取元件在写入元件之前到达伺服扇区。 在第一操作期间，读取伺服扇区的开始的第一长度，并且在写入操作期间，读取比第一长度短的伺服扇区的开始的第二长度，以便在读取时能够写入数据 元件在伺服扇区的至少一部分上。

公开(公告)号：US08619385B1

公开(公告)日：2013-12-31

申请号：US13015844

申请日：2011-01-28

申请人： Guoxiao Guo ,  Jie Yu

发明人： Guoxiao Guo ,  Jie Yu

IPC分类号： G11B5/00

CPC分类号： G11B5/59655 ,  G11B5/59688 ,  G11B20/10 ,  G11B2020/1476

摘要： A disk drive is disclosed comprising a disk including a plurality of sectors each comprising a sector sync mark pattern and sector data preceding and following the sector sync mark pattern, and a head actuated over the disk for generating a read signal. A data sequence is detected from the read signal, and the data sequence is correlated with an extended sync mark comprising a target sync mark pattern and target data. The correlation of the target sync mark pattern with the data sequence is biased relative to the correlation of the target data with the data sequence.

摘要翻译： 公开了一种磁盘驱动器，包括包括多个扇区的盘，每个扇区包括扇区同步标记图案和扇区同步标记图案之前和之后的扇区数据，以及在盘上启动以产生读取信号的磁头。 从读取信号检测数据序列，并且数据序列与包括目标同步标记模式和目标数据的扩展同步标记相关。 目标同步标记模式与数据序列的相关性相对于目标数据与数据序列的相关性有偏差。

公开(公告)号：US07746594B1

公开(公告)日：2010-06-29

申请号：US12240374

申请日：2008-09-29

申请人： Guoxiao Guo ,  Jie Yu

发明人： Guoxiao Guo ,  Jie Yu

IPC分类号： G11B5/596

CPC分类号： G11B5/59688 ,  G11B5/59655

摘要： A disk drive is disclosed comprising a disk having servo data defining a plurality of servo tracks. The servo data comprises a preamble, and a plurality of slanted line servo bursts recorded at a tilt angle with respect to the preamble. The slanted line servo bursts comprises a first plurality of slanted line servo bursts and a second plurality of slanted line servo bursts, wherein the second plurality of slanted line servo bursts are offset radially from the first plurality of slanted line servo bursts. A position error signal (PES) is generated in response to a phase difference when reading the preamble and the slanted line servo bursts.

摘要翻译： 公开了一种磁盘驱动器，其包括具有定义多个伺服磁道的伺服数据的磁盘。 伺服数据包括相对于前导码以倾斜角度记录的前导码和多个斜线伺服脉冲串。 斜线伺服脉冲串包括第一多个倾斜线伺服突发和第二多个倾斜线伺服突发，其中第二多个倾斜线伺服突发从第一多个倾斜线伺服脉冲串径向偏移。 响应于读取前导码和斜线伺服脉冲串时的相位差产生位置误差信号（PES）。

公开(公告)号：US07663835B1

公开(公告)日：2010-02-16

申请号：US11770554

申请日：2007-06-28

申请人： Jie Yu ,  Guoxiao Guo

发明人： Jie Yu ,  Guoxiao Guo

IPC分类号： G11B5/596

CPC分类号： G11B5/59627 ,  G11B19/045

摘要： A system and method for efficiently identifying track squeeze errors (TSEs) of a disk of a disk drive during a testing process for the disk drive is disclosed. The method includes reading servo bursts from a track of the disk, utilizing a modeled scan variable, and determining a gain comprising a ratio of a first matrix A and a second matrix B. TSEs associated with the SWEs of the servo bursts are determined for the track. The TSEs are determined as a product of the gain and a measured scan variable wherein the measured scan variable is calculated as being the difference between a measured scan value and an estimated nominal scan value.

摘要翻译： 公开了一种用于在磁盘驱动器的测试过程期间有效地识别磁盘驱动器的磁盘的磁道挤压错误（TSE）的系统和方法。 该方法包括从盘的轨道读取伺服脉冲串，利用建模的扫描变量，以及确定包括第一矩阵A和第二矩阵B的比率的增益。与伺服脉冲串的SWE相关联的TSE被确定为 跟踪。 TSE被确定为增益和测量的扫描变量的乘积，其中测量的扫描变量被计算为测量的扫描值和估计的标称扫描值之间的差。

公开(公告)号：US09052701B1

公开(公告)日：2015-06-09

申请号：US13585679

申请日：2012-08-14

申请人： Qingwei Jia ,  Shuyu Cao ,  Guoxiao Guo ,  Jie Yu

发明人： Qingwei Jia ,  Shuyu Cao ,  Guoxiao Guo ,  Jie Yu

IPC分类号： G05B5/01

CPC分类号： G05B5/01 ,  G11B5/59611 ,  G11B5/59622 ,  H02P25/034

摘要： A disk drive is disclosed comprising a disk comprising a plurality of servo tracks defined by servo sectors recorded around the circumference of the disk at a servo sampling frequency, and a servo control system operable to actuate a head over the disk by generating a control signal applied to an actuator. A first sinusoid is injected into the servo control system and a first DC component (dc1) is measured in the control signal. A second sinusoid is injected into the servo control system and a second DC component (dc2) is measured in the control signal, wherein the second sinusoid comprises a phase offset from the first sinusoid. A resonance mode of the servo control system is measured based on dc1 and dc2.

摘要翻译： 公开了一种磁盘驱动器，其包括盘，该盘包括以伺服采样频率记录在盘周围的伺服扇区所限定的多个伺服轨迹;以及伺服控制系统，可操作以通过产生施加的控制信号来驱动磁盘上的磁头 到致动器。 在伺服控制系统中注入第一个正弦曲线，并在控制信号中测量第一个直流分量（dc1）。 将第二正弦波注入到伺服控制系统中，并且在控制信号中测量第二直流分量（dc2），其中第二正弦波包括与第一正弦波相位偏移。 基于dc1和dc2测量伺服控制系统的谐振模式。