公开(公告)号：US08970980B1

公开(公告)日：2015-03-03

申请号：US13169938

申请日：2011-06-27

申请人： Abhishek Dhanda ,  Wei Guo ,  Russ A. Quisenberry ,  Guoxiao Guo ,  Jie Yu

发明人： Abhishek Dhanda ,  Wei Guo ,  Russ A. Quisenberry ,  Guoxiao Guo ,  Jie Yu

IPC分类号： G11B21/02 ,  G11B5/596

CPC分类号： G11B5/59688 ,  G11B5/59655

摘要： A disk drive is disclosed comprising a disk and a head actuated over the disk. A burst metric is generated in response to a burst read signal. The burst metric comprises at least one of an alpha metric comprising a ratio of a first burst amplitude of a first phased based servo burst measured at a first radial offset to a second burst amplitude of a second phased based servo burst measured at a second radial offset, a harmonic metric comprising a ratio of a first harmonic of the burst read signal as the head is moved radially over the disk to a higher harmonic of the burst read signal as the head is moved radially over the disk, and a spiral track crossing metric comprising a first and second interval each representing a partial duration of the read element crossing a spiral track.

摘要翻译： 公开了一种磁盘驱动器，其包括盘和在盘上致动的磁头。 响应于突发读取信号产生突发度量。 突发度量包括以下中的至少一个：α度量，其包括在第一径向偏移处测量的第一基于相位的猝发脉冲的第一脉冲串幅度与在第二径向偏移量测量的基于第二相位的伺服脉冲串的第二脉冲串幅度的比率 当磁头径向移动到磁盘上时，当磁头在磁盘上径向移动到脉冲串读取信号的高次谐波时，包括突发读取信号的第一谐波的比率的谐波度量，以及螺旋轨迹交叉度量 包括第一和第二间隔，每个间隔代表穿过螺旋轨道的读取元件的部分持续时间。

公开(公告)号：US08693123B1

公开(公告)日：2014-04-08

申请号：US13170000

申请日：2011-06-27

申请人： Guoxiao Guo ,  Jie Yu ,  Abhishek Dhanda

发明人： Guoxiao Guo ,  Jie Yu ,  Abhishek Dhanda

IPC分类号： G11B5/09

CPC分类号： G11B5/59688 ,  G11B5/09

摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of tracks defined by a plurality of servo sectors. An estimated track ID is generated representing an estimated radial location of the head. A high order Gray code in a first servo sector is detected, and errors in the high order Gray code are corrected using the estimated track ID to generate a corrected Gray code. The corrected Gray code is decoded into a first part of a detected track ID. A low order track code is detected in the first servo sector, and the low order track code is decoded into a second part of the detected track ID. The first part of the detected track ID is combined with the second part of the detected track ID.

摘要翻译： 公开了一种磁盘驱动器，包括在包括由多个伺服扇区限定的多个磁道的盘上驱动的磁头。 生成表示头部的估计的径向位置的估计的轨迹ID。 检测第一伺服扇区中的高阶格雷码，并使用估计的轨道ID校正高阶格雷码中的误差，以产生经校正的格雷码。 校正的格雷码被解码成检测到的轨迹ID的第一部分。 在第一伺服扇区中检测到低阶轨道码，并且将低阶轨道码解码为检测到的轨道ID的第二部分。 检测到的轨道ID的第一部分与检测到的轨道ID的第二部分组合。

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：US07916422B1

公开(公告)日：2011-03-29

申请号：US12790608

申请日：2010-05-28

申请人： Guoxiao Guo ,  Abhishek Dhanda ,  Jie Yu

发明人： Guoxiao Guo ,  Abhishek Dhanda ,  Jie Yu

IPC分类号： G11B5/596 ,  G11B5/00

CPC分类号： G11B5/59655 ,  G11B5/59688

摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo tracks defined by a plurality of servo sectors, wherein each servo sector comprises a plurality of servo bursts, and each servo burst comprises a predetermined phase. After positioning the head over one of the servo tracks, a servo burst in one of the servo sectors is read to generate a read signal, and a sine and cosine component are extracted from the read signal. At least one of the sine and cosine components is rotated by an angle based on a radial location of the head. A position error signal for the head is generated in response to the rotated component.

摘要翻译： 公开了一种磁盘驱动器，包括在包括由多个伺服扇区定义的多个伺服磁道的盘上致动的磁头，其中每个伺服扇区包括多个伺服脉冲串，并且每个伺服脉冲串包括预定的相位。 在将磁头定位在伺服磁道之一上之后，读取其中一个伺服扇区中的伺服脉冲以产生读取信号，并从读取信号中提取正弦和余弦分量。 正弦和余弦分量中的至少一个基于磁头的径向位置旋转角度。 响应于旋转的分量产生头部的位置误差信号。

公开(公告)号：US07898762B1

公开(公告)日：2011-03-01

申请号：US12582863

申请日：2009-10-21

申请人： Guoxiao Guo ,  Abhishek Dhanda ,  Jie Yu

发明人： Guoxiao Guo ,  Abhishek Dhanda ,  Jie Yu

IPC分类号： G11B5/596

CPC分类号： G11B5/59688

摘要： A disk drive is disclosed comprising a head actuated over a disk, the disk including a plurality of servo sectors wherein each servo sector comprises at least one servo burst. A read signal emanating from the head is sampled while reading a servo burst in a servo sector to generate a plurality of sample values. A quality metric is generated in response to a plurality of sample values of a servo sub-burst representing part of the servo burst. When the quality metric does not exceed a threshold, the servo sub-burst sample values are excluded when generating a position error signal (PES) representing a position of the head over the disk. When the quality metric exceeds the threshold, the servo sub-burst sample values are included when generating the PES. The head is then positioned over the disk in response to the PES.

摘要翻译： 公开了一种磁盘驱动器，包括在盘上致动的磁头，磁盘包括多个伺服扇区，其中每个伺服扇区包括至少一个伺服脉冲串。 在读取伺服扇区中的伺服脉冲串时，从头发出的读取信号被采样以产生多个采样值。 响应于表示伺服脉冲串的一部分的伺服子突发的多个采样值产生质量度量。 当质量度量不超过阈值时，当生成表示磁头在磁盘上的位置的位置误差信号（PES）时，排除伺服子突发样本值。 当质量度量超过阈值时，在生成PES时包括伺服子突发样本值。 然后，头部响应于PES被定位在盘上。

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：US06963472B2

公开(公告)日：2005-11-08

申请号：US09894480

申请日：2001-06-27

申请人： Zhimin He ,  Guoxiao Guo ,  Hua Qian ,  EngHong Ong

发明人： Zhimin He ,  Guoxiao Guo ,  Hua Qian ,  EngHong Ong

IPC分类号： G11B5/54 ,  G11B5/55 ,  G11B21/16

CPC分类号： G11B5/5521

摘要： The present invention provides for a flexural pivot that can be fitted within a cavity of an actuator. The pivot includes a first member that can be coupled to the wall defining the cavity and a second member that can be mounted to the disc drive housing component of the disc drive. At least two leaves join external surfaces of the first member to the second member.The present invention offers a flexural pivot that can be easily incorporated with rotary actuators traditionally designed for use with a ball bearing pivot cartridge. In addition, it avoids the difficulties encountered by conventional designs when trying to assemble intersecting flat springs within a cylindrical sleeve. Furthermore, in comparison with conventional flexural pivots that are located outside the actuator body, the present invention provides a compact pivot that can be mounted substantially in a cavity of the actuator body such that the center of rotation of the actuator is located nearer the center of mass.

摘要翻译： 本发明提供了一种可以安装在致动器的空腔内的弯曲枢轴。 该枢轴包括可连接到限定空腔的壁的第一构件和可安装到盘驱动器的盘驱动器壳体部件的第二构件。 至少两个叶片将第一构件的外表面连接到第二构件。 本发明提供一种弯曲枢轴，其可以容易地结合有传统上设计用于与球轴承枢轴筒一起使用的旋转致动器。 此外，它避免了当试图在圆柱形套筒内组装交叉的平面弹簧时常规设计遇到的困难。 此外，与位于致动器主体外部的常规弯曲枢轴相比，本发明提供了一种紧凑的枢轴，其可以基本上安装在致动器本体的空腔中，使得致动器的旋转中心位于 质量

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。