公开(公告)号：US06795261B2

公开(公告)日：2004-09-21

申请号：US09893090

申请日：2001-06-27

申请人： KokHoe Chia ,  TeckKhoon Lim ,  CheeWai Lum ,  Myint Ngwe ,  BengWee Quak

发明人： KokHoe Chia ,  TeckKhoon Lim ,  CheeWai Lum ,  Myint Ngwe ,  BengWee Quak

IPC分类号： G11B2736

CPC分类号： G11B5/09 ,  G11B20/1883 ,  G11B27/36 ,  G11B2220/20

摘要： Method and apparatus for increasing process yields of data storage devices which store data on media surfaces using read/write heads. An initial linear bit recording density is determined for each head, the linear bit recording density comprising a density at which each head is capable of writing data to and reading data from the corresponding media surface. Defective storage sectors are identified on the media surfaces to determine whether a sufficient number of logical storage sectors are available to meet a predetermined data storage capacity. The linear bit recording density of at least one of the heads is then altered to ensure that the storage device has sufficient logical storage sectors to meet the predetermined capacity.

摘要翻译： 用于增加使用读/写头在介质表面上存储数据的数据存储设备的处理产量的方法和装置。 对于每个头部确定初始线性位记录密度，线性位记录密度包括每个头部能够将数据写入和从相应介质表面读取数据的密度。 在介质表面上识别不良的存储扇区，以确定足够数量的逻辑存储扇区是否可用于满足预定的数据存储容量。 然后更改至少一个磁头的线性位记录密度，以确保存储设备具有足够的逻辑存储扇区以满足预定容量。

公开(公告)号：US06947232B2

公开(公告)日：2005-09-20

申请号：US10000257

申请日：2001-11-02

申请人： TeckKhoon Lim ,  Myint Ngwe ,  KokHoe Chia

发明人： TeckKhoon Lim ,  Myint Ngwe ,  KokHoe Chia

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/82 ,  G11B20/18 ,  G11B27/36

CPC分类号： G11B5/012 ,  G11B5/00 ,  G11B5/82 ,  G11B20/1816 ,  G11B27/36 ,  G11B2005/001

摘要： Method and apparatus for detecting defects in a magnetic medium of a data handling system. The magnetic medium includes a number of user data wedges each disposed between an adjacent pair of servo data wedges. A predetermined data sequence is written to the user data wedges, and subsequently read to generate a readback signal. A sequence of discrete time sample values are generated from the readback signal. Defects in the medium are detected in relation to the magnitudes of the discrete time samples. A media scan controller outputs a first multi-bit information record having at least one bit composing the address of the user data wedge containing a defect, and a second multi-bit information record having at least one bit composing an address of the defect within the user data wedge. No information is written to the buffer when no defects are identified.

摘要翻译： 一种用于检测数据处理系统的磁介质中的缺陷的方法和装置。 磁介质包括各自设置在相邻的一对伺服数据楔之间的用户数据楔。 将预定的数据序列写入用户数据楔，然后读取以生成回读信号。 从回读信号产生一系列离散时间采样值。 相对于离散时间样本的幅度检测介质中的缺陷。 媒体扫描控制器输出具有构成包含缺陷的用户数据楔的地址的至少一个比特的第一多比特信息记录，以及第二多比特信息记录，其具有至少一个比特，构成该缺陷内的缺陷的地址 用户数据楔。 当没有识别到​​缺陷时，没有信息写入缓冲区。

公开(公告)号：US06757119B2

公开(公告)日：2004-06-29

申请号：US09896029

申请日：2001-06-29

申请人： SoonWah Leow ,  KokSeng Lim ,  TienHiong Lee ,  KokHoe Chia ,  TeckKhoon Lim

发明人： SoonWah Leow ,  KokSeng Lim ,  TienHiong Lee ,  KokHoe Chia ,  TeckKhoon Lim

IPC分类号： G11B2736

CPC分类号： G11B20/1816 ,  G11B5/012 ,  G11B7/0079 ,  G11B20/1258 ,  G11B27/36 ,  G11B2220/20

摘要： A recording surface is segmented into a plurality of radial zones each containing a plurality of concentric tracks on which data may be recorded. The recording surface is initially formatted with a data frequency for each zone such that all of the zones have substantially the same data density. The data frequency is reduced for a first zone whose error rate is initially less than the predetermined error rate so that the first zone exhibits an error rate meeting the predetermined error rate. The data frequency for a second zone whose data transfer error factor initially exceeds the predetermined error rate is increased to restore any loss of storage capacity of the recording surface due to the reduced data frequency in the first zone. As a result, the data density in the first zone is substantially less than a nominal data density and the data density in a second zone is substantially greater than the nominal data density. The data storage capacity of the recording surface is at least as great as a minimum data storage capacity.

摘要翻译： 记录表面被分割成多个径向区域，每个径向区域包含可记录数据的多个同心轨道。 记录表面最初被格式化为每个区域的数据频率，使得所有区域具有基本上相同的数据密度。 对于错误率最初小于预定错误率的第一区域，数据频率降低，使得第一区域呈现满足预定错误率的错误率。 其数据传输误差因子最初超过预定误差率的第二区的数据频率增加，以恢复记录表面的存储容量的任何损失，这是由于第一区中的数据频率降低。 结果，第一区域中的数据密度基本上小于标称数据密度，并且第二区域中的数据密度基本上大于标称数据密度。 记录表面的数据存储容量至少与最小数据存储容量一样大。

公开(公告)号：US20050244167A1

公开(公告)日：2005-11-03

申请号：US10834480

申请日：2004-04-29

申请人： Sanyuan Liew ,  TeckKhoon Lim ,  CheeFong Oh ,  WengKhin Chew ,  KokHoe Chia ,  SongWee Teo

发明人： Sanyuan Liew ,  TeckKhoon Lim ,  CheeFong Oh ,  WengKhin Chew ,  KokHoe Chia ,  SongWee Teo

IPC分类号： G11B5/596 ,  H04B10/06

CPC分类号： G11B5/59605

摘要： Method and apparatus for determining a signal-to-noise ratio (SNR) value from a readback signal, such as in a data storage device. A readback signal is obtained by a receiver (such as a data transducing head) coupled to a data recovery channel having a variable gain amplifier (VGA) and a threshold detector (TD). The data channel applies a selectable VGA gain value to the readback signal while errors are accumulated using a selectable error detection threshold from the TD. The SNR value is determined at least from a magnitude of the error detection threshold, and preferably from first and second VGA gain values using a linear regression model. The determined SNR value is highly correlated to classical SNR values obtained using external equipment such as an analyzer or oscilloscope, and is advantageously used in automated fashion during high volume manufacturing certification testing.

摘要翻译： 用于从诸如数据存储设备中的回读信号确定信噪比（SNR）值的方法和装置。 通过耦合到具有可变增益放大器（VGA）和阈值检测器（TD）的数据恢复通道的接收器（例如数据传输头）获得回读信号。 数据通道将可选择的VGA增益值应用于回读信号，同时使用TD的可选误差检测阈值积累错误。 SNR值至少从误差检测阈值的大小确定，优选地使用线性回归模型从第一和第二VGA增益值确定。 确定的SNR值与使用诸如分析仪或示波器之类的外部设备获得的经典SNR值高度相关，并且在大批量制造认证测试期间有利地以自动化方式使用。

公开(公告)号：US07173781B2

公开(公告)日：2007-02-06

申请号：US10607420

申请日：2003-06-26

申请人： TeckKhoon Lim ,  QuekLeong Choo ,  WeiMing Yeow ,  SanYuan Liew

发明人： TeckKhoon Lim ,  QuekLeong Choo ,  WeiMing Yeow ,  SanYuan Liew

IPC分类号： G11B27/36 ,  G11B5/09 ,  G11B5/596

CPC分类号： G11B27/36 ,  G11B5/59627

摘要： Embodiments of the present invention include a method and an apparatus for generating an optimal MRO for a zone having a plurality of tracks. A disc drive controller determines the optimum MRO of a zone of tracks by analyzing multiple tracks in the zone with the actuator arm located at a series of offsets relative to the track center. Selected tracks in the zone are written to once. Then the selected tracks in the zone are sequentially read at a first offset, and the corresponding errors recorded. This reading is repeated for each of the offsets until all offsets have been analyzed. Based on the offset, or band of offsets, with the least errors over the selected tracks, the optimum MRO can be selected for the zone. The process can be repeated for each zone and the optimum MRO values stored in an MRO table in the disc drive for use during subsequent read and write operations.

摘要翻译： 本发明的实施例包括用于为具有多个轨道的区域生成最佳MRO的方法和装置。 磁盘驱动器控制器通过分析区域中的多个轨道来确定轨道区域的最佳MRO，致动臂位于相对于轨道中心的一系列偏移处。 区域中的选定轨道写入一次。 然后在第一个偏移顺序读取该区域中的所选轨道，并记录相应的错误。 对于每个偏移重复该读数，直到所有的偏移被分析为止。 基于偏移量偏移或偏移带，在所选轨道上具有最小误差，可以为该区域选择最佳MRO。 可以对每个区域重复该过程并且存储在磁盘驱动器中的MRO表中的最佳MRO值用于在随后的读取和写入操作期间使用。

公开(公告)号：US06785077B2

公开(公告)日：2004-08-31

申请号：US10033065

申请日：2001-10-29

申请人： TeckKhoon Lim ,  SoonWah Leow ,  ChewHoon Angie Neo

发明人： TeckKhoon Lim ,  SoonWah Leow ,  ChewHoon Angie Neo

IPC分类号： G11B509

CPC分类号： G11B20/1816 ,  G11B5/012 ,  G11B27/36 ,  G11B33/10 ,  G11B2005/001 ,  G11B2220/20

摘要： In a pattern zero verification test, a data track of a disc drive is read. During the reading of the data track, on-the-fly counting of potential non-zero data bytes (potential count), sectors on which ECC correction has been performed (corrected sector count), and user data bytes on which ECC correction has been performed (corrected byte count) is performed. Next, various conditions of the potential, corrected sector, and corrected byte counts are checked to determine whether the data track includes only zero data bytes.

摘要翻译： 在模式零验证测试中，读取磁盘驱动器的数据轨道。 在读取数据轨道期间，潜在的非零数据字节（电位计数）的实时计数，已经执行了ECC校正的扇区（校正扇区计数）以及ECC校正的用户数据字节 执行（校正字节计数）。 接下来，检查电位，校正扇区和校正字节计数的各种条件以确定数据轨道是否仅包括零数据字节。