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1. 发明授权

US06765744B2 Track pitch control using head offset measurement for self-servowriting tracks in a disc drive 有权
标题翻译：使用光盘驱动器中自伺服轨迹的磁头偏移测量来跟踪音高控制
公开(公告)号：US06765744B2
公开(公告)日：2004-07-20
申请号：US10028636
申请日：2001-12-19
申请人： Kevin Arthur Gomez , Qiang Bi , Aik Chuan Lim , Jimmy Tze Ming Pang
发明人： Kevin Arthur Gomez , Qiang Bi , Aik Chuan Lim , Jimmy Tze Ming Pang
IPC分类号： G11B2102
CPC分类号： G11B5/59611
摘要： A method of, apparatus for, and means for controlling pitch of a servowritten track on a disc in a disc drive are disclosed. The disc drive has a head for traversing over a surface of the disc. The head has a read element and a write element separated by a head element offset &Dgr;. A servowriting controller operably connected to the disc drive creates a track k by writing servo information on the disc. The servowriting controller then calculates the head element offset &Dgr; at the track k, [&Dgr;CALC(k)] and determines a skew angle &thgr; at the track k, [&thgr;(k)]. The servowriting controller adjusts a track pitch correction factor based on the &Dgr;CALC(K) and the &thgr;(k) such that the track pitch correction factor is utilized to servowrite a next track.
摘要翻译：公开了一种用于控制盘驱动器中的盘上的伺服轨道的俯仰的方法，装置和装置。磁盘驱动器具有用于在盘的表面上移动的磁头。头部具有读取元素和由头元素偏移量Delta分隔的写入元素。可操作地连接到盘驱动器的伺服驱动控制器通过在盘上写入伺服信息来创建轨迹k。伺服驱动控制器然后计算磁道k处的磁头元素偏移量Delta（ΔCALC（k）]，并确定轨道k处的偏斜角θ，θ（k）]。伺服驱动控制器基于DeltaCALC（K）和θ（k）来调整轨道间距校正因子，使得轨道间距校正因子用于对下一个轨道进行编译。

2. 发明授权

US06754030B2 Optimal reader-to-writer offset measurement of a head in a disc drive for reduced track misregistration 有权
标题翻译：磁盘驱动器中头部的最佳读写器偏移测量用于减少轨道重合失调
公开(公告)号：US06754030B2
公开(公告)日：2004-06-22
申请号：US10029318
申请日：2001-12-21
申请人： Edmun Chian Song Seng , Xiong Liu , Aik Chuan Lim , Kay Hee Tang , Utt Heng Kan , Choon Kiat Lim
发明人： Edmun Chian Song Seng , Xiong Liu , Aik Chuan Lim , Kay Hee Tang , Utt Heng Kan , Choon Kiat Lim
IPC分类号： G11B500
CPC分类号： G11B20/20 , G11B5/59627 , G11B27/36 , G11B2220/20
摘要： A method of and apparatus for generating a reader-to-writer offset for a head positioned over a track on a disc in a disc drive having a plurality of tracks is disclosed. A reader and a writer are mounted on the head in a non-overlapping manner with a gap between the reader and the writer, which is known as the reader-to-writer offset. A disc drive controller is operably connected to the reader and the writer. The disc drive controller determines the reader-to-writer offset of the head for each track by computing the difference between a first head position x1 and a second head position x2. The first head position x1 is an optimal head position for writing information on the track and the second head position x2 is a midpoint of an off-track capability (OTC) of the head. The OTC is a portion of a track pitch over which the reader is expected to read information that is free of an incorrigible bit error such that the writer-to-reader track misregistration (TMR) is minimized as the head is radially displaced the reader-to-writer offset to read information written on the track or to write information on the track.
摘要翻译：公开了一种用于为位于具有多个磁道的磁盘驱动器中的磁盘上的轨道上的磁头产生读取器到写入器偏移的方法和装置。阅读器和写入器以不重叠的方式安装在头上，读取器和写入器之间的间隙被称为读写器偏移。磁盘驱动器控制器可操作地连接到读取器和写入器。磁盘驱动器控制器通过计算第一磁头位置x1和第二磁头位置x2之间的差来确定每个轨道的磁头的读写器偏移。第一头位置x1是用于在轨道上写入信息的最佳头部位置，而第二头部位置x2是头部的偏离轨迹能力（OTC）的中点。 OTC是轨道间距的一部分，阅读器期望阅读器读取没有不可避免的位错误的信息，使得写入器到读取器轨迹重合失调（TMR）最小化，因为磁头使读取器 - 写入器偏移以读取写在轨道上的信息或在轨道上写入信息。

3. 发明授权

US06771441B2 Track mis-registration measurement for a disc drive 失效
标题翻译：跟踪磁盘驱动器的错误注册测量
公开(公告)号：US06771441B2
公开(公告)日：2004-08-03
申请号：US10029518
申请日：2001-12-21
申请人： KayHee Tang , Xiong Liu , Aik Chuan Lim , Edmun C. Seng , UttHeng Kan , ChoonKiat Lim
发明人： KayHee Tang , Xiong Liu , Aik Chuan Lim , Edmun C. Seng , UttHeng Kan , ChoonKiat Lim
IPC分类号： G11B2736
CPC分类号： G11B5/59633 , G11B27/36
摘要： An apparatus and method of predicting functional capability of a data storage device having a plurality of information tracks, comprising performing a DC erase on three adjacent information tracks, writing a predetermined bit pattern on a middle track of the three adjacent information tracks, providing a first signal from the bit pattern to a variable gain amplifier to generate a first value of the variable gain amplifier, performing DC erases on the information tracks adjacent the middle track, reading the bit pattern from the middle track to provide a second signal to the variable gain amplifier to generate a second value of the variable gain amplifier, and operating on the first and second values of the variable gain amplifier to provide a track mis-registration value for use with a predetermined threshold value to determine the functional capability of the data storage device.
摘要翻译：一种预测具有多个信息轨道的数据存储装置的功能能力的装置和方法，包括在三个相邻信息轨道上执行DC擦除，在三个相邻信息轨道的中间轨道上写入预定位图案，提供第一从位模式到可变增益放大器的信号，以产生可变增益放大器的第一值，在与中间轨道相邻的信息轨道上执行直流擦除，从中间轨道读取位模式以向可变增益提供第二信号放大器以产生可变增益放大器的第二值，并且对可变增益放大器的第一和第二值进行操作以提供跟预定阈值一起使用的轨道误配值，以确定数据存储装置的功能能力。

4. 发明授权

US06990607B2 System and method for adaptive storage and caching of a defect table 有权
公开(公告)号：US06990607B2
公开(公告)日：2006-01-24
申请号：US09965669
申请日：2001-09-27
申请人： Jeffrey Soon Beng Sim , WeiLoon Ng , Aik Chuan Lim , YongPeng Chng , Kay Hee Tang , Steven TianChye Cheok
发明人： Jeffrey Soon Beng Sim , WeiLoon Ng , Aik Chuan Lim , YongPeng Chng , Kay Hee Tang , Steven TianChye Cheok
IPC分类号： G06F11/00
CPC分类号： G11B20/1883 , G11B2220/20
摘要： In one embodiment of the present invention, systems and methods are provided through which the capacity of a defect buffer in a microcontroller of a mass storage device is determined without regard for the quantity of defects on a recording medium. The capacity of the defect buffer is determined in varying examples, based on the amount of available buffer space and/or the application of the storage device. In one embodiment, the capacity of the defect buffer is less than the quantity of defects on the recording medium, wherein entries in a defect table on the recording medium are swapped in and out of the defect buffer as needed, such as using a most-recently-used scheme. In another embodiment of the present invention, systems and methods are provided through which the defect table is partitioned into a plurality of segments that are physically distributed throughout the recording medium.

5. 发明授权

US06985319B2 Pattern-based defect description method 有权
标题翻译：基于模式的缺陷描述方法
公开(公告)号：US06985319B2
公开(公告)日：2006-01-10
申请号：US09851767
申请日：2001-05-09
申请人： Ying Ee Yip , Aik Chuan Lim , Yong Peng Chng , Steven TianChye Cheok , Wei Loon Ng
发明人： Ying Ee Yip , Aik Chuan Lim , Yong Peng Chng , Steven TianChye Cheok , Wei Loon Ng
IPC分类号： G11B5/09
CPC分类号： G11B5/09 , G11B5/012 , G11B20/18 , G11B20/1883 , G11B2020/1826 , G11B2220/20
摘要： The present invention provides a method of describing defects that requires less memory space than conventional methods. Entries of a first defect table are sorted according to the type of track layout, or zones. They are then grouped into clusters. Each cluster is characterized by a set of new parameters, including a starting sector, a scratch parameter, a span parameter, and an angle parameter. The new parameters are stored in a second table, replacing the corresponding entries in the first table. In this manner, a single entry in the second table replaces one or more entries in the first table with one entry in the first table.
摘要翻译：本发明提供了一种描述与常规方法相比需要更少存储空间的缺陷的方法。根据轨道布局或区域的类型对第一个缺陷表的条目进行排序。然后将它们分组成簇。每个集群的特征在于一组新的参数，包括起始扇区，划痕参数，跨度参数和角度参数。新参数存储在第二个表中，替换第一个表中的相应条目。以这种方式，第二个表中的单个条目将第一个表中的一个或多个条目替换为第一个表中的一个条目。

6. 发明授权

US06574723B2 Method of overflow-based defect management representation 有权
公开(公告)号：US06574723B2
公开(公告)日：2003-06-03
申请号：US09860826
申请日：2001-05-18
申请人： Yong Peng Chng , Aik Chuan Lim , Patrick Tai Heng Wong , Chew Boon Toh , Steven Tian Chye Cheok
发明人： Yong Peng Chng , Aik Chuan Lim , Patrick Tai Heng Wong , Chew Boon Toh , Steven Tian Chye Cheok
IPC分类号： G06F1210
CPC分类号： G11B27/36 , G11B5/012 , G11B20/1883 , G11B2220/20
摘要： A method of storing values that involves splitting each value into a n-bit value and an overflow value, and storing, in a main table, the n-bit values in order of increasing magnitude of the values. For each overflow value, the position of the smallest n-bit value is stored in an overflow table. To retrieve a value, the position of the corresponding n-bit value is compared to the positions stored in the overflow value to determine the overflow value of the n-bit value. The actual value is then obtained from the n-bit value and its overflow value.

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