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1. 发明授权

US08717704B1 Disk drive defining non-circular data tracks relative to a rotation axis of the disk 有权
标题翻译：磁盘驱动器定义相对于磁盘的旋转轴的非圆形数据轨道
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。

2. 发明申请

US20140055883A1 METHOD AND STRUCTURE FOR IMPROVING PERFORMANCE AND STORAGE DENSITY IN A DATA STORAGE DEVICE 有权
标题翻译：提高数据存储设备性能和存储密度的方法和结构
公开(公告)号：US20140055883A1
公开(公告)日：2014-02-27
申请号：US13593991
申请日：2012-08-24
申请人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba
发明人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba
IPC分类号： G11B5/596
CPC分类号： G11B20/1252 , G11B5/09 , G11B5/5543 , G11B5/56 , G11B5/59694 , G11B2020/1238
摘要： A data storage device with improved data storage densities, coupled with lower hard error and write-inhibit events is described. A feed-forward write inhibit (FFWI) method enables data tracks to be written more densely. Alternatively, the FFWI method may reduce the hard error and write inhibit events to improve data storage performance. A concept of virtual tracks enables the FFWI method to be applied to the writing of circular data tracks with non-circular servo tracks, or to the writing of non-circular data tracks with PES data from circular servo tracks—in both cases, improvements to performance and/or storage densities are enabled. The FFWI method may also be applied to the case of both non-circular servo and data tracks.
摘要翻译：描述了具有改进的数据存储密度以及更低的硬错误和禁止写入事件的数据存储设备。前馈写禁止（FFWI）方法使数据轨道更加密集地写入。或者，FFWI方法可以减少硬错误和写禁止事件以提高数据存储性能。虚拟轨道的概念使得FFWI方法能够应用于用非圆形伺服轨迹写入圆形数据轨道，或者用于从圆形伺服轨迹写入具有PES数据的非圆形数据轨迹 - 在这两种情况下，改进性能和/或存储密度启用。 FFWI方法也可以应用于非圆形伺服和数据轨道的情况。

3. 发明授权

US08576506B1 Disk drive estimating reader/writer gap across servo zones 失效
标题翻译：磁盘驱动器估计读写器与伺服区之间的差距
公开(公告)号：US08576506B1
公开(公告)日：2013-11-05
申请号：US13529817
申请日：2012-06-21
申请人： Honge Wang , Michael Chang , Abhishek Dhanda , Huanxiang Ruan , Guoxiao Guo
发明人： Honge Wang , Michael Chang , Abhishek Dhanda , Huanxiang Ruan , Guoxiao Guo
IPC分类号： G11B5/09
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 sectors defining a plurality of servo tracks. The servo tracks form a plurality of servo zones. A disk locked clock is synchronized relative to a servo data rate of the servo zone the head is over. A first reader/writer gap is measured in cycles of the disk locked clock at a first servo track in the first servo zone. A second reader/writer gap is measured in cycles of the disk locked clock at a second servo track in the second servo zone. The first and second reader/writer gaps are normalized to generate a normalized first and second reader/writer gaps. A third reader/writer gap is estimated in cycles of the disk locked clock at a third servo track in the second servo zone based on the normalized first and second reader/writer gaps.
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。伺服轨道形成多个伺服区。磁盘锁定时钟相对于磁头结束的伺服区域的伺服数据速率同步。第一读取器/写入器间隙以第一伺服区中的第一伺服磁道的盘锁定时钟的周期进行测量。第二读取器/写入器间隙以第二伺服区中的第二伺服磁道的盘锁定时钟的周期进行测量。第一和第二读/写器间隙被归一化以产生归一化的第一和第二读/写器间隙。基于归一化的第一和第二读取器/写入器间隙，以第二伺服区中的第三伺服轨道的盘锁定时钟的周期估计第三读取器/写入器间隙。

4. 发明授权

US08531798B1 Disk drive adjusting servo burst signals to compensate for radial velocity of the head 失效
标题翻译：磁盘驱动器调整伺服突发信号以补偿磁头的径向速度
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。

5. 发明申请

US20130135764A1 IMPLEMENTING DATA TRACK PITCH ADJUSTMENT UNDER OPERATIONAL VIBRATION CONDITIONS 有权
标题翻译：在操作振动条件下执行数据跟踪调整
公开(公告)号：US20130135764A1
公开(公告)日：2013-05-30
申请号：US13306736
申请日：2011-11-29
申请人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba , Zvonimir Z. Bandic
发明人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba , Zvonimir Z. Bandic
IPC分类号： G11B27/36
CPC分类号： G11B5/59627 , G11B5/59694 , G11B20/1217 , G11B2020/1228 , G11B2020/1238 , G11B2220/2516
摘要： A method, apparatus and a data storage device are provided for implementing data track pitch adjustment for data written on a recordable surface of a storage device under operational vibration conditions. An operational vibration disturbance spectrum is detected during a write operation and the data track pitch is selectively adjusted based on the detected operational vibration disturbance spectrum. The adjusted track pitch information is saved and used during a read operation.
摘要翻译：提供了一种方法，装置和数据存储装置，用于在操作的振动条件下为存储装置的可记录表面上写入的数据实现数据轨道间距调整。在写入操作期间检测到操作的振动干扰频谱，并且基于检测到的操作振动干扰谱选择性地调整数据轨道间距。调整后的音高信息在读取操作期间被保存和使用。

6. 发明授权

US08953266B2 Method and structure for improving performance and storage density in a data storage device 有权
标题翻译：用于提高数据存储设备中的性能和存储密度的方法和结构
公开(公告)号：US08953266B2
公开(公告)日：2015-02-10
申请号：US13593991
申请日：2012-08-24
申请人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba
发明人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba
IPC分类号： G11B5/54
CPC分类号： G11B20/1252 , G11B5/09 , G11B5/5543 , G11B5/56 , G11B5/59694 , G11B2020/1238
摘要： A data storage device with improved data storage densities, coupled with lower hard error and write-inhibit events is described. A feed-forward write inhibit (FFWI) method enables data tracks to be written more densely. Alternatively, the FFWI method may reduce the hard error and write inhibit events to improve data storage performance. A concept of virtual tracks enables the FFWI method to be applied to the writing of circular data tracks with non-circular servo tracks, or to the writing of non-circular data tracks with PES data from circular servo tracks—in both cases, improvements to performance and/or storage densities are enabled. The FFWI method may also be applied to the case of both non-circular servo and data tracks.
摘要翻译：描述了具有改进的数据存储密度以及更低的硬错误和禁止写入事件的数据存储设备。前馈写禁止（FFWI）方法使数据轨道更加密集地写入。或者，FFWI方法可以减少硬错误和写禁止事件以提高数据存储性能。虚拟轨道的概念使得FFWI方法可以应用于用非圆形伺服轨迹写入圆形数据轨道，或者用于从圆形伺服轨迹写入具有PES数据的非圆形数据轨迹 - 在这两种情况下，改进性能和/或存储密度启用。 FFWI方法也可以应用于非圆形伺服和数据轨道的情况。

7. 发明授权

US07916422B1 Disk drive rotating phase based servo bursts based on radial location of head 有权
标题翻译：基于磁头径向位置的磁盘驱动旋转相位伺服脉冲串
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。

8. 发明授权

US07898762B1 Disk drive excluding servo sub-bursts when computing position error signal 有权
标题翻译：计算位置误差信号时磁盘驱动器不包括伺服子突发
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。

9. 发明授权

US08970980B1 Disk drive evaluating burst metric 有权
标题翻译：磁盘驱动器评估突发度量
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。

10. 发明授权

US08724248B2 Method and apparatus for compensating vibration by adjusting track pitch 有权
标题翻译：通过调节轨道间距来补偿振动的方法和装置
公开(公告)号：US08724248B2
公开(公告)日：2014-05-13
申请号：US13306736
申请日：2011-11-29
申请人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba , Zvonimir Z. Bandic
发明人： Abhishek Dhanda , Toshiki Hirano , Tetsuo Semba , Zvonimir Z. Bandic
IPC分类号： G11B21/02
CPC分类号： G11B5/59627 , G11B5/59694 , G11B20/1217 , G11B2020/1228 , G11B2020/1238 , G11B2220/2516
摘要： A method, apparatus and a data storage device are provided for implementing data track pitch adjustment for data written on a recordable surface of a storage device under operational vibration conditions. An operational vibration disturbance spectrum is detected during a write operation and the data track pitch is selectively adjusted based on the detected operational vibration disturbance spectrum. The adjusted track pitch information is saved and used during a read operation.
摘要翻译：提供了一种方法，装置和数据存储装置，用于在操作的振动条件下为存储装置的可记录表面上写入的数据实现数据轨道间距调整。在写入操作期间检测到操作的振动干扰频谱，并且基于检测到的操作振动干扰谱选择性地调整数据轨道间距。调整后的音高信息在读取操作期间被保存和使用。

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