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1. 发明授权

US07773336B2 Harmonic measurement for head-disk spacing control using user data 失效
标题翻译：使用用户数据进行头盘间距控制的谐波测量
公开(公告)号：US07773336B2
公开(公告)日：2010-08-10
申请号：US12323367
申请日：2008-11-25
申请人： Carl Xiaodong Che , Yawshing Tang , Haejung Lee
发明人： Carl Xiaodong Che , Yawshing Tang , Haejung Lee
IPC分类号： G11B21/02
CPC分类号： G11B5/6029 , G11B5/5534 , G11B5/6064 , G11B5/607
摘要： A hard disk drive that determines a flying height from a ratio of a first harmonic transfer function and a third harmonic transfer function. The transfer functions can be determined from a response to an impulse function. The impulse function (also known as an impulse response) can be a playback waveform de-convolved by channel data sequence. Any change in the ratio of the first and third harmonic transfer functions corresponds to a change in the flying height. The disk drive may utilize the transfer function ratios in a feedback routine to control the flying height.
摘要翻译：硬盘驱动器，从一次谐波传递函数和三次谐波传递函数的比率确定飞行高度。传递函数可以根据对脉冲函数的响应来确定。脉冲函数（也称为脉冲响应）可以是通过通道数据序列去卷积的重放波形。第一和第三谐波传递函数的比率的任何变化对应于飞行高度的变化。磁盘驱动器可以利用反馈程序中的传递函数比来控制飞行高度。

2. 发明申请

US20100128399A1 HARMONIC MEASUREMENT FOR HEAD-DISK SPACING CONTROL USING USER DATA 失效
标题翻译：使用用户数据进行头盘间距控制的谐波测量
公开(公告)号：US20100128399A1
公开(公告)日：2010-05-27
申请号：US12323367
申请日：2008-11-25
申请人： Carl Xiaodong Che , Yawshing Tang , Haejung Lee
发明人： Carl Xiaodong Che , Yawshing Tang , Haejung Lee
IPC分类号： G11B21/24
CPC分类号： G11B5/6029 , G11B5/5534 , G11B5/6064 , G11B5/607
摘要： A hard disk drive that determines a flying height from a ratio of a first harmonic transfer function and a third harmonic transfer function. The transfer functions can be determined from a response to an impulse function. The impulse function (also known as an impulse response) can be a playback waveform de-convolved by channel data sequence. Any change in the ratio of the first and third harmonic transfer functions corresponds to a change in the flying height. The disk drive may utilize the transfer function ratios in a feedback routine to control the flying height.
摘要翻译：硬盘驱动器，从一次谐波传递函数和三次谐波传递函数的比率确定飞行高度。传递函数可以根据对脉冲函数的响应来确定。脉冲函数（也称为脉冲响应）可以是通过通道数据序列去卷积的重放波形。第一和第三谐波传递函数的比率的任何变化对应于飞行高度的变化。磁盘驱动器可以利用反馈程序中的传递函数比来控制飞行高度。

3. 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。

4. 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。

5. 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。

6. 发明授权

US07830632B2 Large data block written on overlapping tracks in a hard disk drive 有权
标题翻译：写在硬盘驱动器中的重叠轨道上的大数据块
公开(公告)号：US07830632B2
公开(公告)日：2010-11-09
申请号：US11820707
申请日：2007-06-19
申请人： Yawshing Tang , Carl Xiaodong Che
发明人： Yawshing Tang , Carl Xiaodong Che
IPC分类号： G11B5/09
CPC分类号： G11B5/596 , G11B5/012 , G11B20/1262 , G11B2020/10537 , G11B2020/1292 , G11B2220/2516
摘要： A hard disk drive with a disk that includes a first group of tracks and a second group of tracks. The second group of tracks are used to write large blocks of data. For example, data in the second group may be video or audio. The second group of tracks has a higher track density than the first group of tracks. The large data block is written sequentially in the second group of tracks so that there is only one adjacent track write within the group. Using only one adjacent track write allows the tracks within the second group to be overlapped to increase track density.
摘要翻译：具有包括第一组轨道和第二组轨道的盘的硬盘驱动器。第二组轨道用于写入大块数据。例如，第二组中的数据可以是视频或音频。第二组轨道具有比第一组轨道更高的轨道密度。大数据块被顺序地写入第二组轨道，使得在该组内只有一个相邻轨迹写入。仅使用一个相邻轨道写入允许第二组内的轨道重叠以增加轨道密度。

7. 发明授权

US07768728B2 Detecting head/disk contact using timing jitter 有权
标题翻译：使用定时抖动检测磁头/磁盘接触
公开(公告)号：US07768728B2
公开(公告)日：2010-08-03
申请号：US12001231
申请日：2007-12-10
申请人： Yawshing Tang , Carl Xiaodong Che
发明人： Yawshing Tang , Carl Xiaodong Che
IPC分类号： G11B27/36
CPC分类号： G11B27/3027 , G11B20/10222 , G11B20/18 , G11B2220/2516
摘要： A disk drive that includes a head and a disk. The disk drive also includes a circuit that can detect head/disk contact from a jitter determined from a read signal provided by the head. The jitter may correspond to the time interval between two detected sync marks. Alternatively, the jitter may correspond to a change in frequency of a read clock generated from the read signal. These approaches allow for detection of head movement in a down track direction. Down track is a direction that is essentially parallel with the longitudinal axis of the head.
摘要翻译：包含磁头和磁盘的磁盘驱动器。磁盘驱动器还包括可以从由头提供的读取信号确定的抖动来检测磁头/磁盘接触的电路。抖动可以对应于两个检测到的同步标记之间的时间间隔。或者，抖动可以对应于从读取信号产生的读取时钟的频率变化。这些方法允许在下行轨道方向上检测头部运动。下轨道是基本上与头部的纵向轴线平行的方向。

8. 发明授权

US07742251B2 Timing insensitive method and apparatus for spectral analysis in a disk recording system 失效
标题翻译：磁盘记录系统中光谱分析的时序不灵敏的方法和装置
公开(公告)号：US07742251B2
公开(公告)日：2010-06-22
申请号：US12150810
申请日：2008-04-30
申请人： Yawshing Tang , Carl Xiaodong Che , Na-Young Kim
发明人： Yawshing Tang , Carl Xiaodong Che , Na-Young Kim
IPC分类号： G11B5/09
CPC分类号： G11B5/02 , G11B5/6005 , G11B5/6029 , G11B2005/0018
摘要： A hard disk drive that includes a disk that contains at least one signal and a head that is coupled to the disk. The disk drive also contains a circuit that includes a data sampler that generates a plurality of data samples from the signal, a harmonic sensor coupled to the data sampler and a spectral power accumulator coupled to the harmonic sensor. The harmonic sensor accumulates the data samples. The circuit includes a window generator that determines a window length of the data samples accumulated by the harmonic sensor. The spectral power accumulator accumulates the windows of sample data accumulated by the harmonic sensor. The sample data accumulated by the spectral power accumulator can be accessed by a processor that performs a spectral analysis of the data.
摘要翻译：一个硬盘驱动器，其中包含一个至少包含一个信号的磁盘和一个耦合到磁盘的磁头。磁盘驱动器还包含电路，该电路包括从信号产生多个数据样本的数据采样器，耦合到数据采样器的谐波传感器和耦合到谐波传感器的频谱功率累加器。谐波传感器累积数据样本。该电路包括窗口发生器，其确定由谐波传感器累积的数据样本的窗口长度。光谱功率累加器累积由谐波传感器累积的采样数据的窗口。由频谱功率累加器积累的采样数据可以由执行数据的频谱分析的处理器来访问。

9. 发明授权

US07885028B2 Data error recovery using voting on multiple retrials 失效
标题翻译：数据错误恢复使用多次重试投票
公开(公告)号：US07885028B2
公开(公告)日：2011-02-08
申请号：US12082150
申请日：2008-04-08
申请人： Yawshing Tang , Carl Xiaodong Che , Na-Young Kim
发明人： Yawshing Tang , Carl Xiaodong Che , Na-Young Kim
IPC分类号： G11B5/09 , G11B27/36 , G11B5/03
CPC分类号： G11B5/09 , G11B20/18 , G11B2020/183 , G11B2220/2516
摘要： A hard disk drive with a disk that has a plurality of data bits. The drive includes a circuit that reads each data bit n times and selects a value for the bit based on the most frequent occurrence of one of a plurality of values. This process provides a voting technique that enhances the quality of accurately captured data.
摘要翻译：具有磁盘的具有多个数据位的硬盘驱动器。驱动器包括读取每个数据位n次的电路，并且基于多个值中的一个值的最频繁出现来选择位的值。该过程提供了一种提高精确捕获数据质量的投票技术。

10. 发明申请

US20100177418A1 WRITER AND READER CENTER ALIGNMENT WITH SERVO AND DATA TRACK IN DISCRETE TRACK RECORDING 审中-公开
标题翻译： WRITER和READER中心对齐与伺服和数据跟踪在分离轨迹记录
公开(公告)号：US20100177418A1
公开(公告)日：2010-07-15
申请号：US12353918
申请日：2009-01-14
申请人： Yawshing Tang , Carl Xiaodong Che
发明人： Yawshing Tang , Carl Xiaodong Che
IPC分类号： G11B27/36 , G11B5/596
CPC分类号： G11B5/5547 , B82Y10/00 , G11B5/743 , G11B20/22 , G11B27/36 , G11B2005/0002 , G11B2220/2516
摘要： A hard disk drive with a patterned disk that has a discrete track. The disk drive includes a controller that controls a head and a voice coil motor to optimize a writing of information onto the discrete track. Writing optimization can occur by initially writing a track of information and recording the write position. The written track is then located by reading the information with a read element of a drive head and analyzing a quality of the read signal, such as signal amplitude or error rate. The read position is then recorded. The information is erased and the head is moved. The process of writing, finding the written track location, storing the write and read positions and again moving the head is repeated. The write and read positions that provide the best quality signal is saved and subsequently used to write and read data on the discrete track.
摘要翻译：具有带有离散轨道的图案化磁盘的硬盘驱动器。磁盘驱动器包括控制头和音圈电机的控制器，以优化将信息写入离散轨道。写入优化可以通过初始写入信息轨迹并记录写入位置来进行。然后通过用驱动头的读取元件读取信息并分析诸如信号幅度或错误率的读取信号的质量来定位写入的轨迹。然后记录读取位置。信息被清除，头部移动。重复写入过程，找到写入的轨迹位置，存储写入和读取位置以及再次移动头部。提供最佳质量信号的写入和读取位置被保存并随后用于在离散轨道上写入和读取数据。

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