公开(公告)号：US06646448B2

公开(公告)日：2003-11-11

申请号：US09957940

申请日：2001-09-21

申请人： Beng Theam Ko ,  Eng Hock Lim ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

发明人： Beng Theam Ko ,  Eng Hock Lim ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

IPC分类号： G01R3106

CPC分类号： G01R31/06 ,  G11B5/455

摘要： A writer coil in a data head of a data storage system is tested by coupling detection circuitry to the writer coil and driving the writer coil with a periodic pulse signal generated by the detection circuitry. As a result, voltage is generated, with the detection circuitry, as a function of an inductance of the writer coil. An inductance of the writer coil is calculated as a function of the generated voltage. Electrical short circuits and discontinuities in the writer coil are identified as a function of the calculated inductance.

公开(公告)号：US07215494B2

公开(公告)日：2007-05-08

申请号：US10263322

申请日：2002-10-01

申请人： Jun Wang ,  Challa Anantha Lakshmi ,  Xueyi Miao ,  Kan Liang Gan ,  Myint Ngwe

发明人： Jun Wang ,  Challa Anantha Lakshmi ,  Xueyi Miao ,  Kan Liang Gan ,  Myint Ngwe

IPC分类号： G11B27/36

CPC分类号： G11B5/59605 ,  G11B5/5547 ,  G11B27/36

摘要： A system and method for performing read retry operations with respect to an erroneously read data sector is disclosed. The system and method use estimates of bit error rates determined during previous attempts to read data from the sector to determine an optimal distance and direction to move a read transducer for a subsequent read retry of the erroneously data sector.

摘要翻译： 公开了一种用于对错误读取的数据扇区执行读取重试操作的系统和方法。 系统和方法使用在先前尝试从扇区读取数据以确定用于移动读取换能器以用于错误数据扇区的后续读取重试的最佳距离和方向时确定的误码率的估计。

公开(公告)号：US20070043963A1

公开(公告)日：2007-02-22

申请号：US11208317

申请日：2005-08-19

申请人： CheeWee Cheng ,  KianWai Ng ,  QuekLeong Choo ,  Myint Ngwe ,  KahLiang Gan

发明人： CheeWee Cheng ,  KianWai Ng ,  QuekLeong Choo ,  Myint Ngwe ,  KahLiang Gan

IPC分类号： G06F1/32

CPC分类号： G06F1/3203

摘要： Methods and associated apparatus to reduce electrical power consumption in an information channel may include identifying times at which to restore power to elements in the information channel, and restoring power to the elements at the identified times. Times for each element are identified based on a recovery time for that element to reach a sufficiently stable operating point before a transition to an active mode of operation. By maximizing the length of time individual elements may stay in the reduced power mode, power savings may be maximized without negatively affecting information channel performance.

摘要翻译： 用于减少信息信道中的电功率消耗的方法和相关设备可以包括识别在信息信道中恢复功率到元件的时间，以及在所识别的时间恢复元件的功率。 基于在转换到主动操作模式之前该元件达到足够稳定的工作点的恢复时间来识别每个元件的时间。 通过最大化单个元件可以保持在降低功率模式的时间长度，可以最大化功率节省，而不会不利地影响信息信道性能。

公开(公告)号：US06724562B1

公开(公告)日：2004-04-20

申请号：US09538535

申请日：2000-03-30

申请人： Chiap Heok Ang ,  Niroot Jierapipatanakul ,  Beng Theam Ko ,  Myint Ngwe ,  Beng Wee Quak ,  Choonkiat Lim

发明人： Chiap Heok Ang ,  Niroot Jierapipatanakul ,  Beng Theam Ko ,  Myint Ngwe ,  Beng Wee Quak ,  Choonkiat Lim

IPC分类号： G11B5596

CPC分类号： G11B5/59633

摘要： A method for writing servo patterns on at least one disc in a disc drive that has a first set of tracks and a second set of tracks on a major surface of the disc includes stepping between the tracks of the first set of tracks at a first constant angle, and stepping between the tracks of the second set of tracks at a second constant angle. Stepping between tracks in the first group or the second group includes selecting two adjacent tracks from either the first group of tracks or the second group of tracks, and determining the angle through which an actuator assembly must be rotated between the two adjacent tracks selected to produce a selected track pitch. The method produces a disc for a disc drive with a first set of tracks, and a second set of tracks in which the track pitch varies across the set of tracks.

摘要翻译： 一种用于在盘驱动器中的至少一个盘上写入伺服图案的方法，所述盘驱动器具有第一组轨道，并且在所述盘的主表面上的第二组轨道包括在所述第一组轨道的轨道之间以第一常数 角度，并以第二恒定角度在第二组轨道的轨迹之间进行步进。 在第一组或第二组中的轨道之间的步进包括从第一组轨道或第二组轨道中选择两个相邻的轨道，并且确定致动器组件必须在被选择产生的两个相邻轨道之间旋转的角度 选定的音高。 该方法产生用于具有第一组轨道的盘驱动器的盘，以及轨道间距在该组轨道上变化的第二组轨道。

公开(公告)号：US06724550B2

公开(公告)日：2004-04-20

申请号：US09955621

申请日：2001-09-19

申请人： Eng Hock Lim ,  Beng Theam Ko ,  Hweepeng Teo ,  Fong Kheon Chong ,  Myint Ngwe ,  Kah Liang Gan

发明人： Eng Hock Lim ,  Beng Theam Ko ,  Hweepeng Teo ,  Fong Kheon Chong ,  Myint Ngwe ,  Kah Liang Gan

IPC分类号： G11B502

CPC分类号： G11B5/012 ,  G11B5/09 ,  G11B20/24

摘要： A method for the adaptive dampening of a peak amplitude of a thermal asperity signal in a disc drive to minimize loss of read data integrity, including the steps of determining a peak-to-peak preamble signal amplitude for identifying an amplitude signal range of the peak amplitude of the thermal asperity signal; measuring the peak amplitude of the thermal asperity signal; separating the peak-to-peak preamble signal amplitude into substantially even portions for use in calculating a value of the amplitude signal range of the peak amplitude of the thermal asperity signal; calculating the value of the amplitude signal range of the peak amplitude of the thermal asperity signal for use in determining a dampening resistance used by a dampening circuit to adaptively dampen the peak amplitude of the thermal asperity signal; and activating the dampening circuit to dampen the peak amplitude of the thermal asperity signal.

摘要翻译： 一种用于自适应衰减磁盘驱动器中的热不平坦信号的峰值振幅的方法，以最小化读取数据完整性的损失，包括以下步骤：确定峰 - 峰前导信号幅度，以识别峰值的振幅信号范围 热凹凸信号的振幅; 测量热凹凸信号的峰值振幅; 将峰 - 峰前导信号振幅分离成基本上均匀的部分，以用于计算热不平坦信号的峰值幅度的振幅信号范围的值; 计算用于确定由衰减电路使用的阻尼电阻以自适应地抑制热凹凸信号的峰值振幅的热凹凸信号的峰值振幅的振幅信号范围的值; 并激活衰减电路以抑制热凹凸信号的峰值振幅。

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：US06606211B1

公开(公告)日：2003-08-12

申请号：US09556884

申请日：2000-04-19

申请人： Tuang Liang Bernard Lim ,  Myint Ngwe ,  Hwee Peng Teo ,  Fong Kheon Chong

发明人： Tuang Liang Bernard Lim ,  Myint Ngwe ,  Hwee Peng Teo ,  Fong Kheon Chong

IPC分类号： G11B509

CPC分类号： G11B20/1816 ,  G11B5/012 ,  G11B20/1883 ,  G11B20/1889 ,  G11B27/36 ,  G11B2220/20

摘要： Apparatus for detecting defect in a recordable medium such as a disc drive is disclosed. The apparatus includes a recording system which write and read test data on the medium. The apparatus also includes a first comparator for comparing the read data to a first threshold. A first and a second counter, operably connected to the first comparator, are incremented when the read data exceeds the first threshold. When the first counter obtains a first count value, a first defect signal is produced. Data domains associated with the recordable medium are marked as bad in response to the first defect signal. When the second counter obtains a second count value, a second defect signal is produced and data sectors associated with the recordable medium are marked as bad in response to the second defect signal. A method for detecting defects in a recordable medium is also disclosed.

摘要翻译： 公开了一种用于检测诸如盘驱动器的可记录介质中的缺陷的装置。 该装置包括在介质上写入和读取测试数据的记录系统。 该装置还包括用于将读取的数据与第一阈值进行比较的第一比较器。 当读取的数据超过第一阈值时，可操作地连接到第一比较器的第一计数器和第二计数器递增。 当第一计数器获得第一计数值时，产生第一缺陷信号。 与可记录介质相关联的数据域响应于第一缺陷信号被标记为不良。 当第二计数器获得第二计数值时，产生第二缺陷信号，并且响应于第二缺陷信号将与可记录介质相关联的数据扇区标记为不良。 还公开了一种用于检测可记录介质中的缺陷的方法。

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：US20080043356A1

公开(公告)日：2008-02-21

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： 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：US20070262888A1

公开(公告)日：2007-11-15

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： H03M7/34

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。