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1. 发明申请

US20110128646A1 SYNCHRONIZED REWRITING OF DATA 有权
标题翻译：数据同步化
公开(公告)号：US20110128646A1
公开(公告)日：2011-06-02
申请号：US12629437
申请日：2009-12-02
申请人： Michael Alex , Xiaodong Che , Zhen Jin , Michael Paul Salo
发明人： Michael Alex , Xiaodong Che , Zhen Jin , Michael Paul Salo
IPC分类号： G11B21/02
CPC分类号： G11B19/041 , G11B5/02 , G11B20/10009 , G11B20/10398 , G11B2005/001 , G11B2020/10898 , G11B2220/2516
摘要： A hard disk drive (HDD) including a magnetic disk, the magnetic disk including a data track. The HDD also includes a synchronized rewrite controller for synchronizing a plurality of rewrites of a data pattern on a location of the track of the magnetic disk and the HDD includes a write head controlled by the synchronized rewrite controller for writing the data pattern on the location of the data track and rewriting the data pattern a plurality of times on the location in synchronization with a prior writing of the data pattern on the data track.
摘要翻译：包括磁盘的硬盘驱动器（HDD），磁盘包括数据磁道。 HDD还包括同步重写控制器，用于在磁盘的轨道的位置上同步数据模式的多个重写，并且HDD包括由同步重写控制器控制的写入头，用于将数据模式写入到数据跟踪数据跟踪并重写数据模式多次在位置上与数据轨迹上的数据模式的先前写入同步。

2. 发明申请

US20090135693A1 Data recovery through eliminating adjacent track interference 有权
标题翻译：通过消除相邻轨道干扰的数据恢复
公开(公告)号：US20090135693A1
公开(公告)日：2009-05-28
申请号：US11998396
申请日：2007-11-28
申请人： Na Young Kim , Yawshing Tang , Carl Xiaodong Che
发明人： Na Young Kim , Yawshing Tang , Carl Xiaodong Che
IPC分类号： G11B5/02
CPC分类号： G11B5/012 , G11B19/041 , G11B20/18 , G11B2020/183 , G11B2220/2516
摘要： A hard disk drive with a disk that contains a target track and an adjacent track. The drive includes a circuit that determines an error in data read from the target track. Data from the adjacent track is stored in memory. The adjacent track is then erased and the target track data is re-read from the target track. Erasing the adjacent track allows the target track data to be read without adjacent track interference. The data from the adjacent track is typically rewritten onto the disk from memory so no data is lost.
摘要翻译：硬盘驱动器，其中包含目标轨道和相邻轨道的磁盘。驱动器包括确定从目标轨道读取的数据中的错误的电路。来自相邻轨道的数据被存储在存储器中。然后擦除相邻的轨道，并且从目标轨道重新读取目标轨道数据。擦除相邻轨道允许在没有相邻轨道干涉的情况下读取目标轨道数据。来自相邻轨道的数据通常从存储器重写到磁盘上，因此没有数据丢失。

3. 发明申请

US20080316635A1 Deriving servo PES from DC erased bursts in perpendicular recording 审中-公开
标题翻译：从垂直记录中的直流擦除脉冲中导出伺服PES
公开(公告)号：US20080316635A1
公开(公告)日：2008-12-25
申请号：US11820992
申请日：2007-06-20
申请人： Kiseok Moon , Carl Xiaodong Che , Yawshing Tang
发明人： Kiseok Moon , Carl Xiaodong Che , Yawshing Tang
IPC分类号： G11B21/02
CPC分类号： G11B5/59655 , G11B5/59638 , G11B5/59683
摘要： A hard disk drive with a disk that has DC erased servo bursts. The DC erased servo bursts are read by a perpendicular recording head that produces a relatively square burst signal. The burst signal is used determine a position error signal and center the head on a track of the disk.
摘要翻译：具有直流擦除伺服突发的磁盘的硬盘驱动器。 DC擦除的伺服脉冲串由产生相对平方的脉冲串信号的垂直记录头读取。使用突发信号确定位置误差信号，并将磁头中心在磁盘的磁道上。

4. 发明申请

US20080291564A1 Detecting head-disk contact during off-track operations 审中-公开
标题翻译：在离轨操作期间检测磁头盘接触
公开(公告)号：US20080291564A1
公开(公告)日：2008-11-27
申请号：US11805978
申请日：2007-05-25
申请人： Yawshing Tang , Carl Xiaodong Che , Na-Young Kim , Won C. Yang
发明人： Yawshing Tang , Carl Xiaodong Che , Na-Young Kim , Won C. Yang
IPC分类号： G11B21/02
CPC分类号： G11B21/12 , G11B5/5526
摘要： A disk drive that can detect contact between a head and a disk during an off-track operation such as a seek routine, a ramp load or a head take-off. The disk drive includes a circuit that causes the head to move across the disk in a seek routine. A head heater element is driven to move the head into contact with the disk. A read signal provided by the head is filtered through a band pass filter that has a center frequency. The frequency that produces the maximum signal is selected as the center frequency for the band pass filter. The drive can monitor subsequent head contact during an off-track operation by detecting output from the band pass filter.
摘要翻译：磁盘驱动器，可以在诸如寻道程序，斜坡载荷或磁头起飞之类的偏离轨道操作期间检测磁头和磁盘之间的接触。磁盘驱动器包括在寻道例程中使磁头移动通过磁盘的电路。驱动头部加热器元件以移动头部与盘接触。由头部提供的读取信号通过具有中心频率的带通滤波器进行滤波。选择产生最大信号的频率作为带通滤波器的中心频率。驱动器可以通过检测带通滤波器的输出来监视离轨操作期间的后续头部接触。

5. 发明授权

US07420759B2 Apparatus and method for internal calibration of normalized playback transfer curve in a hard disk drive 失效
公开(公告)号：US07420759B2
公开(公告)日：2008-09-02
申请号：US11591745
申请日：2006-10-31
申请人： Xiaodong Che
发明人： Xiaodong Che
IPC分类号： G11B27/36
CPC分类号： G11B20/10009 , G11B2220/2516
摘要： Method calibrates an assembled hard disk drive for read head accessing rotating disk surface, by estimating non-linearity of that playback device based on two data patterns, which have a short transition-pair waveform and a long transition-pair waveform. By linearly constructing a simulated long transition-pair waveform from the short transition-pair waveform and aligning it with the long transition-pair waveform, non-linear distortion is estimated, creating the transfer curve as product of this process. The transfer curve is used to compensate the read data of a track to create the adjusted read data, which is used to decode the track being read. The adjusted read data is the product of this process. The hard disk drive including the transfer table. Second method using transfer table to create adjusted read data for track, the processor, embedded circuit and hard disk drive implementing this method. Manufacturing embedded circuit as product.

6. 发明申请

US20070223128A1 System, method, and apparatus for monitoring stray magnetic fields and protecting disk drives therefrom 失效
标题翻译：用于监测杂散磁场并保护磁盘驱动器的系统，方法和装置
公开(公告)号：US20070223128A1
公开(公告)日：2007-09-27
申请号：US11389827
申请日：2006-03-27
申请人： Xiaodong Che
发明人： Xiaodong Che
IPC分类号： G11B15/04 , G11B27/36 , G11B19/02
CPC分类号： G11B33/1493 , G11B19/04
摘要： A disk drive that protects stored data from stray magnetic fields is disclosed. Sensors for sensing stray magnetic fields are mounted to the base and/or cover of the drive and aligned with the trajectory of the movement of the read/write head. If the sensors, which have memory such as a toggle switch, are exposed to a high stray magnetic field, operation of the drive is suspended until a follow-up algorithm or protocol is implemented. The sensors can sense specific direction of stray fields. The sensor can change resistance if a high stray field is detected. The information in the sensors is collected and processed by the drive controller.
摘要翻译：公开了一种保护存储的数据免受杂散磁场的磁盘驱动器。用于感测杂散磁场的传感器安装到驱动器的底座和/或盖上，并与读/写头的移动轨迹对准。如果具有诸如拨动开关的存储器的传感器暴露于高杂散磁场，则驱动器的操作被暂停，直到实现后续算法或协议。传感器可以感测杂散场的特定方向。如果检测到高杂散场，传感器可以改变电阻。传感器中的信息由驱动控制器收集和处理。

7. 发明授权

US07131346B1 Spin stand testing system with fine positioner for head stack assembly 有权
标题翻译：旋转立柱测试系统，精密定位器用于头部堆叠组装
公开(公告)号：US07131346B1
公开(公告)日：2006-11-07
申请号：US10966543
申请日：2004-10-15
申请人： Jagdeep S. Buttar , David Terrill , Kenneth R. Davies , Herman Ferrier , Xiaodong Che
发明人： Jagdeep S. Buttar , David Terrill , Kenneth R. Davies , Herman Ferrier , Xiaodong Che
IPC分类号： G11B5/56 , G01R33/12
CPC分类号： G11B5/455 , G11B5/4555 , G11B5/5552 , G11B27/36
摘要： Head stack fixtures for securing head stack assemblies to spin stand testing systems, and spin stand testing systems incorporating such fixtures, are disclosed. Exemplary head stack fixtures comprise a base supporting a piezoelectric actuator. The base includes an attachment mechanism for securing the HSA in such a way that the HSA will pivot relative to the base. When the HSA is secured to the base, the piezoelectric actuator engages the HSA. The piezoelectric actuator is therefore able to pivot the HSA relative to the base for fine positioning of a head of the HSA.
摘要翻译：公开了用于固定头部堆叠组件以旋转支架测试系统的头部堆叠固定装置，以及包括这种固定装置的旋转支架测试系统。示例性的顶部堆叠固定装置包括支撑压电致动器的基座。底座包括用于固定HSA的附接机构，使得HSA将相对于底座枢转。当HSA固定在基座上时，压电执行机构接合HSA。因此，压电致动器能够相对于基座枢转HSA，以精确定位HSA的头部。

8. 发明授权

US5583705A Write precompensation optimization in a PRML channel using a selected PRML signal level 失效
标题翻译：使用选定的PRML信号电平在PRML通道中写入预补偿优化
公开(公告)号：US5583705A
公开(公告)日：1996-12-10
申请号：US560084
申请日：1995-11-17
申请人： Pablo A. Ziperovich , Xiaodong Che
发明人： Pablo A. Ziperovich , Xiaodong Che
IPC分类号： G11B5/09 , G11B20/10 , G11B20/12 , G11B20/14 , G11B27/36
CPC分类号： G11B20/10194 , G11B20/10055 , G11B27/36 , G11B20/1258
摘要： Write precomposition optimization for a partial response maximum likelihood ("PRME") magnetic recording chapel adapted to a mass production environment. Optimal write precompensation may be determined by writing a tribit data pattern known to produce worst case nonlinear transition shift ("NLTS") onto a magnetic recording medium; reading back the recorded data pattern; and calculating the mean-squared error ("MSE") for one or more of the equalized data sample levels associated with the PRML channel to be optimized. The writing and reading back process is repeated with varying amounts of precompensation applied to the written pattern. The optimal amount of write precompensation is determined eider by minimizing the MSE for a selected sample level or by minimizing MSE between the middle and the upper or lower of the ternary PRML sample levels.
摘要翻译：为适应于大规模生产环境的部分响应最大似然（“PRME”）磁记录教堂编写预组合优化。可以通过将已知产生最坏情况非线性转变位移（“NLTS”）的三位数据模式写入到磁记录介质上来确定最佳写预补偿; 读回记录数据模式; 以及计算与要优化的PRML信道相关联的一个或多个均衡数据样本水平的均方误差（“MSE”）。重复写入和回读过程，并对写入的图案应用不同量的预补偿。通过最小化所选样本级别的MSE或通过使三进制PRML样本级别的中间和更高或更低之间的MSE最小化来确定写入预补偿的最佳量。

9. 发明授权

US5576906A Synchronous detection of concurrent servo bursts for fine head position in disk drive 失效
标题翻译：同步检测并发伺服脉冲串，用于磁盘驱动器中的精细位置
公开(公告)号：US5576906A
公开(公告)日：1996-11-19
申请号：US320540
申请日：1994-10-11
申请人： Kevin D. Fisher , Jim Fitzpatrick , Xiaodong Che
发明人： Kevin D. Fisher , Jim Fitzpatrick , Xiaodong Che
IPC分类号： G11B5/596 , G11B21/10
CPC分类号： G11B5/59655
摘要： Synchronous detection of fine position servo burst information with a data transducer having an electrical width not less than about two-thirds a width of a data track within a partial response maximum likelihood (PRML) data channel is disclosed. The servo burst information is recorded on a storage medium as a pair or series of fractional-track-width sinewave concurrent burst patterns and includes an on-track phase generating a position error signal which varies linearly with head displacement about track centerline and at least one off-track phase generating a position error signal which varies linearly with head displacement about a position related to track boundary. The method includes steps of reading the on-track phase and the off-track phase with a head to provide an analog signal stream, amplifying and low pass filtering the signal stream to normalize gain of the signal stream, synchronously quantizing the signal stream to provide synchronous digital burst samples, multiplying the synchronous digital burst samples during servo sampling intervals by a normalization factor generated by a correlation signal generator to provide normalized samples, integrating normalized samples originating during the on-track phase to provide an on-track position error signal, and integrating normalized samples originating during the off-track phase to provide an off-track position error signal. Circuitry implementing the method including a discrete matched filter is also disclosed.
摘要翻译：公开了具有不小于部分响应最大似然（PRML）数据信道内的数据轨道宽度的大约三分之二的数据换能器的精细位置伺服突发信息的同步检测。伺服脉冲串信息作为一对或一系列分数轨道宽度正弦波同时脉冲串模式记录在存储介质上，并且包括轨道上相位，其产生与磁道中心线的磁头位移线性变化的位置误差信号，以及至少一个偏离轨道相位产生与围绕与轨道边界相关的位置的磁头位移线性变化的位置误差信号。该方法包括以头为单位读取轨道上相位和偏离轨相位的步骤，以提供模拟信号流，对信号流进行放大和低通滤波以对信号流的增益进行归一化，同步量化信号流以提供同步数字脉冲串采样，在伺服采样间隔期间将同步数字脉冲串采样乘以由相关信号发生器产生的归一化因子，以提供归一化采样，将在轨道相位期间产生的归一化采样积分，以提供在轨位置误差信号，并且在偏离轨道相位期间积分归一化样本以提供偏离位置误差信号。还公开了实现包括离散匹配滤波器的方法的电路。

10. 发明授权

US5493454A Write precompensation optimization in a PRML channel using a selected PRML signal level 失效
标题翻译：使用选定的PRML信号电平在PRML通道中写入预补偿优化
公开(公告)号：US5493454A
公开(公告)日：1996-02-20
申请号：US317902
申请日：1994-10-04
申请人： Pablo A. Ziperovich , Xiaodong Che
发明人： Pablo A. Ziperovich , Xiaodong Che
IPC分类号： G11B5/09 , G11B20/10 , G11B20/12 , G11B20/14 , G11B27/36
CPC分类号： G11B20/10194 , G11B20/10055 , G11B27/36 , G11B20/1258
摘要： Write precompensation optimization for a partial response maximum likelihood ("PRML") magnetic recording channel adapted to a mass production environment. Optimal write precompensation may be determined by writing a tribit data pattern known to produce worst case nonlinear transition shift ("NLTS") onto a magnetic recording medium; reading back the recorded data pattern; and calculating the mean-squared error ("MSE") for one or more of the equalized data sample levels associated with the PRML channel to be optimized. The writing and reading back process is repeated with varying amounts of precompensation applied to the written pattern. The optimal amount of write precompensation is determined either by minimizing the MSE for a selected sample level or by minimizing MSE between the middle and the upper or lower of the ternary PRML sample levels.
摘要翻译：为适应于大规模生产环境的部分响应最大似然（“PRML”）磁记录通道编写预补偿优化。可以通过将已知产生最坏情况非线性转变位移（“NLTS”）的三位数据模式写入到磁记录介质上来确定最佳写预补偿; 读回记录数据模式; 以及计算与要优化的PRML信道相关联的一个或多个均衡数据样本水平的均方误差（“MSE”）。重复写入和回读过程，并对写入的图案应用不同量的预补偿。通过最小化所选样本级别的MSE或通过使三进制PRML样本级别的中间和上限或更低之间的MSE最小化来确定写入预补偿的最佳量。

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