公开(公告)号：US08531798B1

公开(公告)日：2013-09-10

申请号：US12966474

申请日：2010-12-13

申请人： Wei Xi ,  Abhishek Dhanda ,  Guoxiao Guo ,  Jie Yu

发明人： Wei Xi ,  Abhishek Dhanda ,  Guoxiao Guo ,  Jie Yu

IPC分类号： G11B5/596

CPC分类号： G11B5/5547 ,  G11B5/59627

摘要： A disk drive is disclosed comprising a head actuated over a disk comprising a plurality of servo sectors that define a plurality of servo tracks, wherein the servo sectors comprise a plurality of servo bursts. A radial velocity of the head is detected relative to the servo tracks. At least two of the servo bursts are read to generate servo burst signals, and the servo burst signals are adjusted in response to the radial velocity of the head. A position error signal is generated for the head in response to the adjusted servo burst signals.

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，该磁头包括限定多个伺服磁道的多个伺服扇区，其中所述伺服扇区包括多个伺服脉冲串。 相对于伺服磁道检测磁头的径向速度。 读取至少两个伺服脉冲串以产生伺服脉冲串信号，并且响应于磁头的径向速度来调节伺服脉冲串信号。 响应于调整后的伺服脉冲串信号，针对磁头产生位置误差信号。

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：US08717704B1

公开(公告)日：2014-05-06

申请号：US13406797

申请日：2012-02-28

申请人： Jie Yu ,  Guoxiao Guo ,  Jianguo Zhou ,  Sanghoon Chu ,  Young-Hoon Kim ,  Abhishek Dhanda

发明人： Jie Yu ,  Guoxiao Guo ,  Jianguo Zhou ,  Sanghoon Chu ,  Young-Hoon Kim ,  Abhishek Dhanda

IPC分类号： G11B5/58

CPC分类号： G11B5/58 ,  G11B5/59644

摘要： A disk drive is disclosed comprising a disk having a plurality of servo tracks defined by servo sectors, and a head actuated over the disk. The disk drive further comprises control circuitry comprising a servo control system operable to position the head over the disk. A disturbance is induced in the servo control system, and while positioning the head over the disk, a data track is accessed. The disturbance induced in the servo control system causes the data track to be non-circular relative to a rotation axis of the disk such that the non-circular data track crosses multiple of the servo tracks over a revolution of the disk.

摘要翻译： 公开了一种磁盘驱动器，其包括具有由伺服扇区限定的多个伺服磁道的盘，以及在该盘上启动的磁头。 磁盘驱动器还包括控制电路，其包括可操作以将磁头定位在磁盘上的伺服控制系统。 在伺服控制系统中引起干扰，并且当将磁头定位在磁盘上时，可以访问数据磁道。 在伺服控制系统中引起的干扰使得数据轨道相对于盘的旋转轴线是非圆形的，使得非圆形数据轨道在盘的一圈上跨越多个伺服轨道。

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：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：US08824081B1

公开(公告)日：2014-09-02

申请号：US13418966

申请日：2012-03-13

申请人： Guoxiao Guo ,  Jie Yu

发明人： Guoxiao Guo ,  Jie Yu

IPC分类号： G11B5/02

CPC分类号： G11B5/6029 ,  G11B5/59655 ,  G11B5/59688

摘要： A disk drive is disclosed comprising a disk comprising a plurality of data tracks defined by servo sectors. Each servo sector comprises a periodic preamble recorded at a first frequency, servo data, a periodic reference pattern recorded at a second frequency different from the first frequency, and at least one servo burst. A servo sector is processed by processing the periodic preamble to extract the servo data, demodulating the servo burst in response to the periodic reference pattern, generating a position error signal based on the extracted servo data and the demodulated servo burst, and measuring a fly height of the head based on the periodic reference pattern.

摘要翻译： 公开了一种磁盘驱动器，其包括由伺服扇区限定的多个数据磁道的磁盘。 每个伺服扇区包括以第一频率记录的周期性前导码，伺服数据，以与第一频率不同的第二频率记录的周期性参考模式和至少一个伺服脉冲串。 通过处理周期性前同步码处理伺服扇区以提取伺服数据，响应于周期性参考模式解调伺服脉冲，根据所提取的伺服数据和解调的伺服脉冲产生位置误差信号，并测量飞行高度 的头部基于周期性参考图案。

公开(公告)号：US07576941B1

公开(公告)日：2009-08-18

申请号：US11924830

申请日：2007-10-26

申请人： Teddy T. C. Chen ,  Eugene Chun-Tsing Wu ,  John Yin Kwong Li ,  Jie Yu ,  Jonathan V. Nguyen ,  Tuong M. Vu ,  Guoxiao Guo

发明人： Teddy T. C. Chen ,  Eugene Chun-Tsing Wu ,  John Yin Kwong Li ,  Jie Yu ,  Jonathan V. Nguyen ,  Tuong M. Vu ,  Guoxiao Guo

IPC分类号： G11B5/596

CPC分类号： G11B5/59627

摘要： A disk drive is disclosed comprising a plurality of servo sectors that define a plurality of tracks, and a head comprising a read element radially offset from a write element. The read element is positioned over a first track, and the first track is read to generate first read wedge repeatable runout (WRRO) values. A first seek operation of the head positions the read element over a second track, and the second track is read to generate first write WRRO values. The first write WRRO values are used to write the first read WRRO values to the first track. A second seek operation of the head positions the read element over a third track, and the third track is read to generate second write WRRO values. The second write WRRO values are used to write the first write WRRO values to the second track.

摘要翻译： 公开了一种磁盘驱动器，其包括限定多个磁道的多个伺服扇区，以及包括从写入元件径向偏移的读取元件的磁头。 读取元件位于第一轨道上，并且读取第一轨迹以产生第一读取楔形可重复跳动（WRRO）值。 头部的第一寻找操作将读取的元素定位在第二个轨道上，并且读取第二个轨迹以产生第一个写入WRRO值。 第一次写入WRRO值用于将第一个读取的WRRO值写入第一个轨道。 磁头的第二次搜索操作将读取元件定位在第三磁道上，并且读取第三磁道以产生第二写WRRO值。 第二次写入WRRO值用于将第一个写WRRO值写入第二个轨道。