公开(公告)号：US06696832B2

公开(公告)日：2004-02-24

申请号：US10261010

申请日：2002-09-30

申请人： Victor W K Chew ,  Edward Y K Hew ,  David K L Loh ,  Myint Ngwe ,  Wong Hon Leong ,  Say Kwee Teck

发明人： Victor W K Chew ,  Edward Y K Hew ,  David K L Loh ,  Myint Ngwe ,  Wong Hon Leong ,  Say Kwee Teck

IPC分类号： G11B5455

CPC分类号： G11B5/012 ,  G11B5/127 ,  G11B5/3116 ,  G11B5/3166 ,  G11B5/455 ,  G11B2005/001 ,  G11B2005/0013

摘要： An apparatus and associated testing method for identifying void heads in magnetic storage systems in which a first bit error rate is determined using data written at a first overshoot amount. A second bit error rate is determined using data written at a second rate current in a second overshoot amount. A physically damaged transducer head is identified based upon a comparison of the first bit error rate to the second bit error rate.

摘要翻译： 一种用于识别磁存储系统中的空白磁头的装置和相关联的测试方法，其中使用以第一过冲量写入的数据来确定第一误码率。 使用在第二过冲量中以第二速率电流写入的数据来确定第二误码率。 基于第一误码率与第二误码率的比较来识别物理损坏的换能器头。

公开(公告)号：US5999352A

公开(公告)日：1999-12-07

申请号：US857519

申请日：1997-05-16

申请人： Say Kwee Teck ,  Quak Beng Wee ,  Myint Ngwe

发明人： Say Kwee Teck ,  Quak Beng Wee ,  Myint Ngwe

IPC分类号： G11B5/012 ,  G11B5/09 ,  G11B5/48

CPC分类号： G11B5/012 ,  G11B5/4886 ,  G11B5/09

摘要： A disc drive and a method of storing data using the disc drive are disclosed. Multiple data heads are each supported adjacent a corresponding one of multiple disc surfaces of a disc stack to form multiple head/media combinations. A separate guardband or recording density capability for each of the multiple head/media combinations is determined. An actual recording density is assigned to each of the multiple head/media combinations based upon the recording density capability for the particular head/media combination. The actual recording density assigned to each of the multiple head/media combinations can be different from the actual recording densities assigned to other head/media combinations. The disc drive is controlled such that data is recorded on each of the surfaces at the actual recording density assigned thereto.

摘要翻译： 公开了一种磁盘驱动器和使用该盘驱动器存储数据的方法。 多个数据头各自支撑在盘堆叠的多个盘表面中相应的一个上，以形成多个头/媒体组合。 确定多个头/媒体组合中的每一个的单独的保护带或记录密度能力。 基于特定头/媒体组合的记录密度能力，实际记录密度被分配给多个头/媒体组合中的每一个。 分配给多个头/媒体组合中的每一个的实际记录密度可以与分配给其他头/媒体组合的实际记录密度不同。 控制盘驱动器，使得以分配给其的实际记录密度在每个表面上记录数据。

公开(公告)号：US07738201B2

公开(公告)日：2010-06-15

申请号：US11507063

申请日：2006-08-18

申请人： Ming Jin ,  Hiau Choon Kee ,  Myint Ngwe ,  Liu Li

发明人： Ming Jin ,  Hiau Choon Kee ,  Myint Ngwe ,  Liu Li

IPC分类号： G11B5/09 ,  G11B20/10

CPC分类号： G11B20/18 ,  G11B20/10296 ,  G11B2020/183 ,  G11B2220/2516

摘要： In general, this disclosure describes read recovery techniques for data storage devices that use soft information associated with multiple read operations to detect data. Specifically, the read recovery techniques comprise computing soft information for each bit detected during a first read operation of a data storage medium, computing soft information for each bit detected during a second read operation of the data storage medium and averaging the soft information computed during the first and second read operations to determine the value of each of the bits.

摘要翻译： 通常，本公开描述了使用与多个读取操作相关联的软信息来检测数据的数据存储设备的读取恢复技术。 具体地，读取恢复技术包括计算在数据存储介质的第一次读取操作期间检测到的每个位的软信息，计算在数据存储介质的第二次读取操作期间检测到的每个位的软信息，并对在 第一和第二读取操作来确定每个位的值。

公开(公告)号：US07397398B2

公开(公告)日：2008-07-08

申请号：US11431122

申请日：2006-05-09

申请人： Ming Jin ,  Hiauchoon Kee ,  Zhenyu Sun ,  Liu Li ,  Myint Ngwe

发明人： Ming Jin ,  Hiauchoon Kee ,  Zhenyu Sun ,  Liu Li ,  Myint Ngwe

IPC分类号： H03M7/00

CPC分类号： H03M5/145 ,  G11B20/1426 ,  G11B2220/2516

摘要： A data word is error correction encoded to provide a worst case codeword without bit transitions between worst case codeword bits. A modulation bit is calculated as a function of the worst case codeword. The modulation bit has a bit polarity opposite a bit polarity of the worst case codeword bits. The worst case codeword bits are added with the modulation bit to form a modulated code word.

摘要翻译： 对数据字进行纠错编码，以提供最坏情况码字，而不会在最差情况码字位之间进行位转换。 作为最差情况码字的函数计算调制比特。 调制位具有与最坏情况码字位的位极性相反的位极性。 最差情况下，码字比特与调制比特相加以形成调制码字。

公开(公告)号：US06952321B1

公开(公告)日：2005-10-04

申请号：US10119985

申请日：2002-04-10

申请人： EngHock Lim ,  BengTheam Ko ,  Jun Wang ,  MingYou Hu ,  Myint Ngwe

发明人： EngHock Lim ,  BengTheam Ko ,  Jun Wang ,  MingYou Hu ,  Myint Ngwe

IPC分类号： G11B5/596 ,  G11B21/02

CPC分类号： G11B5/59627

摘要： A method of determining run-out in a disc drive involving steps of performing a direct current erase, selecting a reference track, writing a sinusoidal signal into a first track at a first offset from the reference track, sensing a read signal along the reference track, and analyzing the read signal to extract run-out information.

摘要翻译： 一种确定磁盘驱动器中的耗尽的方法，包括执行直流擦除，选择参考磁道，在与参考磁道的第一偏移处将第一磁道写入正弦信号的步骤，沿着参考磁道感测读取信号 ，并分析读取信号以提取耗尽信息。

公开(公告)号：US06839193B2

公开(公告)日：2005-01-04

申请号：US10016341

申请日：2001-12-11

申请人： Fong Kheon Chong ,  Quek Leong Choo ,  Myint Ngwe ,  Jun Wang ,  Kah Liang Gan

发明人： Fong Kheon Chong ,  Quek Leong Choo ,  Myint Ngwe ,  Jun Wang ,  Kah Liang Gan

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/455 ,  G11B5/48 ,  G11B5/596 ,  G11B20/18 ,  G11B27/36 ,  G11B5/09

CPC分类号： G11B5/012 ,  G11B5/455 ,  G11B5/4886 ,  G11B5/59627 ,  G11B20/10481 ,  G11B20/1816 ,  G11B27/36 ,  G11B2005/0016 ,  G11B2220/20

摘要： A method for optimizing the read-to-write offset of a disk drive system in respect of a track is provided. In one aspect the method includes the step of determining a first read position amongst a range of test positions offset relative to the track on the basis of read signal strength. The method further includes the steps of calculating a subrange of test positions about the first read position, selecting a second read position from the subrange on the basis of bit error rates and setting the read-to-write offset as a function of the second read position. In addition a disk drive system including means for optimally setting the read-to-write offset in respect of a track is provided.

公开(公告)号：US06731442B2

公开(公告)日：2004-05-04

申请号：US10066231

申请日：2002-01-31

申请人： Ming Jin ,  Myint Ngwe ,  David Loh ,  Quek Leong Choo ,  Mingyou Hu

发明人： Ming Jin ,  Myint Ngwe ,  David Loh ,  Quek Leong Choo ,  Mingyou Hu

IPC分类号： G11B2736

CPC分类号： G11B20/1883 ,  G11B20/182

摘要： A method is disclosed for detecting defects in a recordable medium such as a hard disc drive based on error energy. The method may include the steps of writing test data to the medium and reading back the test data. The method may also include the steps of computing an error energy based on the square of the difference between the read back data and an ideal version of the test data and comparing the error energy with an energy threshold. The method generates a defect signal when the error energy exceeds the energy threshold. The method may also be used to identify the media defect according to its error energy profile. An apparatus for detecting defects in a recordable medium is also disclosed.

摘要翻译： 公开了一种用于基于误差能量来检测诸如硬盘驱动器的可记录介质中的缺陷的方法。 该方法可以包括将测试数据写入介质并读回测试数据的步骤。 该方法还可以包括以下步骤：基于回读数据和测试数据的理想版本之间的差的平方来计算误差能量，并将误差能量与能量阈值进行比较。 当误差能量超过能量阈值时，该方法产生缺陷信号。 该方法还可以用于根据其误差能量分布来识别介质缺陷。 还公开了一种用于检测可记录介质中的缺陷的装置。

公开(公告)号：US06690532B1

公开(公告)日：2004-02-10

申请号：US09539796

申请日：2000-03-31

申请人： Swee Kieong Choo ,  Jack Ming Teng ,  Hwee Peng Teo ,  Myint Ngwe ,  Beng Wee Quak ,  Kwee Teck Say

发明人： Swee Kieong Choo ,  Jack Ming Teng ,  Hwee Peng Teo ,  Myint Ngwe ,  Beng Wee Quak ,  Kwee Teck Say

IPC分类号： G11B2102

CPC分类号： G11B5/012 ,  G11B5/02

摘要： A method and apparatus for detecting and recovering from head instability in a magneto-resistive (MR) transducer head of a disc-drive system. A head-instability-recovery circuit is described for use in disc drive to recover from a head-instability condition of an MR transducer head. This circuit includes a controller and a current source that supplies current to the MR head. The current source is controlled to supply a nominal amount of current to the MR head when operating in a normal mode, and to supply one or more current bursts having a current above the nominal supply current in order to recover from the head-instability condition. Also described is a method for recovering from a transducer-instability condition of an MR transducer of a disc drive, including detecting a situation that indicates a head-instability-recovery operation is desired, and performing the head-instability-recovery operation.

摘要翻译： 一种用于在盘驱动系统的磁阻（MR）换能器头中的头部不稳定性中检测和恢复的方法和装置。 描述磁头不稳定性恢复电路用于磁盘驱动器以从MR换能器头的磁头不稳定状态恢复。 该电路包括向MR磁头供应电流的控制器和电流源。 控制电流源以在正常模式下工作时向MR磁头提供额定电流量，并且提供具有高于额定电源电流的电流的一个或多个电流脉冲串，以便从头部不稳定状态恢复。 还描述了一种用于从盘驱动器的MR换能器的换能器不稳定状态恢复的方法，其包括检测指示头部不稳定性恢复操作期望的情况，以及执行头部不稳定性恢复操作。

公开(公告)号：US06512647B1

公开(公告)日：2003-01-28

申请号：US09550370

申请日：2000-04-14

申请人： Beng Wee Quak ,  Bernard Tuang Liang Lim ,  Myint Ngwe ,  Song Wee Teo ,  Beng Theam Ko

发明人： Beng Wee Quak ,  Bernard Tuang Liang Lim ,  Myint Ngwe ,  Song Wee Teo ,  Beng Theam Ko

IPC分类号： G11B503

CPC分类号： G11B20/10 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B2005/0018

摘要： A bias current for a magnetoresistive read head is selected by defining a tuning range based on a maximum and a minimum bias current value for the head. A plurality of read operations are iteratively performed using a different bias current value over the tuning range for each iteration. The results of each read iteration are measured and a bias current is selected on the basis of the read error rates, and particularly those bias currents associated with the lowest read error rate.

摘要翻译： 通过基于磁头的最大和最小偏置电流值定义调谐范围来选择磁阻读取头的偏置电流。 在每个迭代的调谐范围内使用不同的偏置电流值迭代地执行多个读取操作。 测量每个读取迭代的结果，并且基于读取错误率选择偏置电流，特别是与最低读取错误率相关联的那些偏置电流。

公开(公告)号：US06188531B1

公开(公告)日：2001-02-13

申请号：US09070271

申请日：1998-04-30

申请人： James Lai Kein Chang ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

发明人： James Lai Kein Chang ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

IPC分类号： G11B509

CPC分类号： G11B5/09 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035

摘要： A system, method, and device for sensing temperature during the writing of information onto magnetic media and providing a sufficient write current for that temperature is disclosed. The system comprises a head responsive to a write current for generating a magnetic flux used in writing data onto the magnetic media, a write current source coupled to the head for receiving a write signal and providing write current to the head, and a temperature responsive device coupled to the write current source that senses temperature and provides a write signal whose magnitude is dependent on temperature.

摘要翻译： 公开了一种用于在将信息写入磁介质并为该温度提供足够的写入电流期间感测温度的系统，方法和装置。 该系统包括响应于写入电流的磁头，用于产生用于将数据写入到磁性介质上的磁通量;耦合到磁头的写入电流源，用于接收写入信号并向磁头提供写入电流;以及温度响应装置 耦合到感应温度的写入电流源，并提供其幅度取决于温度的写入信号。