公开(公告)号：US06920001B2

公开(公告)日：2005-07-19

申请号：US10459735

申请日：2003-06-12

申请人： Teng Hou Sebastian Chua ,  Myint Ngwe ,  Lan Xia ,  Beng Wee Quak ,  Quek Leong Choo

发明人： Teng Hou Sebastian Chua ,  Myint Ngwe ,  Lan Xia ,  Beng Wee Quak ,  Quek Leong Choo

IPC分类号： G11B5/00 ,  G11B27/36 ,  G11B5/02

CPC分类号： G11B27/36 ,  G11B2005/0005 ,  G11B2220/20

摘要： A method of categorizing magnitudes of thermal asperities in a read-back signal of a data storage system includes receiving the read-back signal from a location containing a thermal asperity. A peak magnitude signal is generated from the read-back signal. A threshold signal is generated using a variable threshold generator. The peak magnitude signal is compared to the threshold signal and a magnitude of the thermal asperity is categorized as a function of the comparison.

摘要翻译： 对数据存储系统的回读信号中的热凹凸的大小进行分类的方法包括从包含热不均匀性的位置接收回读信号。 从读回信号产生峰值幅度信号。 使用可变阈值生成器生成阈值信号。 将峰值幅度信号与阈值信号进行比较，将热不均匀度的大小分类为比较的函数。

公开(公告)号：US06560052B2

公开(公告)日：2003-05-06

申请号：US09351737

申请日：1999-07-12

申请人： Wei Loon Ng ,  Beng Wee Quak ,  Wing Hung Chan ,  Swee Kieong Choo ,  Choon Wei Ng ,  Teck Khoon Lim

发明人： Wei Loon Ng ,  Beng Wee Quak ,  Wing Hung Chan ,  Swee Kieong Choo ,  Choon Wei Ng ,  Teck Khoon Lim

IPC分类号： G11B509

CPC分类号： G11B20/1258 ,  G11B5/012 ,  G11B5/09 ,  G11B20/1816 ,  G11B27/105 ,  G11B2005/001 ,  G11B2220/20 ,  G11B2220/2516

摘要： The present invention pertains to an apparatus and method for recording data in a variable bit density disc drive. The disc drive includes a recording surfaces, each having a corresponding head for recording data on the recording surface. At least one head is operated at a different recording frequency from the other heads, creating a variable bit density for the different recording surfaces. The combination of head recording frequencies is determined following an error testing operation and a unique physdisc lookup table is created based on the determined recording frequencies. The physdisc lookup table is used to allocate data sectors and to convert between logical and physical block addresses.

摘要翻译： 本发明涉及一种用于在可变位密度盘驱动器中记录数据的装置和方法。 盘驱动器包括记录表面，每个记录表面具有用于在记录表面上记录数据的相应头部。 至少一个头部以与其他头部不同的记录频率操作，为不同的记录表面创建可变位密度。 头部记录频率的组合在​​误差测试操作之后确定，并且基于所确定的记录频率创建唯一的物理查找表。 physdisc查找表用于分配数据扇区，并在逻辑块和物理块地址之间进行转换。

公开(公告)号：US06549020B2

公开(公告)日：2003-04-15

申请号：US09792884

申请日：2001-02-23

申请人： Eng Hock Lim ,  Quek Leong Choo ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

发明人： Eng Hock Lim ,  Quek Leong Choo ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

IPC分类号： G01R2708

CPC分类号： G11B5/5526 ,  G11B5/5521

摘要： A method for characterizing a bearing cartridge based on a preload applied to the bearing cartridge used in a disc drive, to increase disc drive yield rates. The method begins by loading the bearing cartridge on to a test fixture and to an actuator assembly such that the actuator is rotatably attached to the base by the bearing cartridge. Then, the method includes inducing a steady swing in the actuator. Then, the method includes measuring a voltage drop that occurs across the bearing cartridge during the steady swing to characterize the preload applied to the bearing cartridge.

摘要翻译： 一种用于基于施加到在盘驱动器中使用的轴承盒的预加载来表征轴承盒的方法，以增加盘驱动器的屈服率。 该方法开始于将轴承盒装载到测试夹具和致动器组件上，使得致动器通过轴承筒可旋转地附接到基座。 然后，该方法包括在致动器中引起稳定的摆动。 然后，该方法包括测量在稳定摆动期间在轴承盒上发生的电压降，以表征施加到轴承盒的预载荷。

公开(公告)号：US6100683A

公开(公告)日：2000-08-08

申请号：US24668

申请日：1998-02-17

申请人： Bernard Tuang Liang Lim ,  Alan Choon Young Tan ,  Myint Ngwe ,  Beng Wee Quak

发明人： Bernard Tuang Liang Lim ,  Alan Choon Young Tan ,  Myint Ngwe ,  Beng Wee Quak

IPC分类号： G01R33/12

CPC分类号： G01R33/1207

摘要： Head disc interference is detected and analyzed using the standard deviation of read back signal frequency. First, the amount of longitudinal head oscillation affecting transducer read/write heads located in the hard drive is measured. Measuring the longitudinal head oscillation is achieved by determining the degree of frequency modulation associated with the read-back signal as compared with a constant frequency used to write the information. Second, this measured amount of oscillation is compared to a predefined threshold value. Finally, a head disc interference alarm is activated when the oscillation is greater than the defined threshold value.

摘要翻译： 使用回读信号频率的标准偏差检测和分析头盘干扰。 首先，测量影响位于硬盘驱动器中的换能器读/写头的纵向头振荡的量。 与用于写入信息的恒定频率相比，通过确定与回读信号相关联的频率调制程度来测量纵向磁头振荡。 第二，将该测量的振荡量与预定义的阈值进行比较。 最后，当振荡大于定义的阈值时，头盘干扰报警被激活。

公开(公告)号：US06903889B2

公开(公告)日：2005-06-07

申请号：US10461558

申请日：2003-06-11

申请人： Liu Li ,  Quek Leong Choo ,  Song Wee Teo ,  Myint Ngwe ,  Beng Wee Quak

发明人： Liu Li ,  Quek Leong Choo ,  Song Wee Teo ,  Myint Ngwe ,  Beng Wee Quak

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B20/10 ,  G11B27/36

CPC分类号： G11B20/10481 ,  G11B5/00 ,  G11B5/012 ,  G11B20/10009 ,  G11B27/36 ,  G11B2005/001 ,  G11B2005/0016 ,  G11B2005/0018 ,  G11B2220/20

摘要： A method of tuning a bias parameter for a magnetoresistive head in a data storage system includes the step of identifying, from multiple possible bias parameter values, a smallest bias parameter value for the magnetoresistive head which both maintains a bit error rate above a predetermined threshold bit error rate, and which satisfies a second criteria. The method then includes the step of setting an operational bias parameter value for the magnetoresistive head to the identified smallest bias parameter value. Also disclosed are data storage systems, or controllers which are connectable to or included with data storage systems, configured to implement the methods.

摘要翻译： 调整数据存储系统中的磁阻头的偏置参数的方法包括从多个可能的偏置参数值中识别用于磁阻头的最小偏置参数值的步骤，所述最小偏置参数值都保持高于预定阈值位的误码率 错误率，满足第二个标准。 该方法然后包括将磁阻头的操作偏置参数值设置为所识别的最小偏置参数值的步骤。 还公开了数据存储系统或可连接到数据存储系统或包括在数据存储系统中的控制器，被配置为实现这些方法。

公开(公告)号：US06831804B2

公开(公告)日：2004-12-14

申请号：US09810435

申请日：2001-03-16

申请人： Kian Keong Ooi ,  Ming Zhong Ding ,  Lee Ling Tan ,  Wing Kong Chiang ,  Beng Wee Quak ,  Yang Quan Chen

发明人： Kian Keong Ooi ,  Ming Zhong Ding ,  Lee Ling Tan ,  Wing Kong Chiang ,  Beng Wee Quak ,  Yang Quan Chen

IPC分类号： G11B5596

CPC分类号： G11B5/59627 ,  G11B5/5582

摘要： A method of handling resonance effects on disc drives includes the steps of monitoring a position error signal (PES) for an actuator arm of a disc drive, generating a feedforward compensation signal from the PES using a bandpass filter, and applying the compensation signal to a servo control signal. The bandpass filter has a center frequency set to a known resonance frequency. A disc drive includes an actuator assembly including an arm for carrying a head in a transducing relation with respect to a disc in response to a control signal, and a controller that monitors a PES for the arm and generates the control signal. The controller includes a servo controller that generates a servo control signal from the PES, and a feedforward compensation element which bandpass filters the PES to generate a compensation signal which is combined with the servo control signal to generate the control signal.

摘要翻译： 一种处理对磁盘驱动器的共振效应的方法包括以下步骤：监视磁盘驱动器的致动器臂的位置误差信号（PES），使用带通滤波器从PES生成前馈补偿信号，并将补偿信号施加到 伺服控制信号。 带通滤波器具有设置为已知谐振频率的中心频率。 盘驱动器包括致动器组件，该致动器组件包括用于响应于控制信号而携带相对于盘的转换关系的头的臂，以及监控臂的PES并产生控制信号的控制器。 控制器包括产生来自PES的伺服控制信号的伺服控制器，以及前馈补偿元件，其通过对PES进行滤波以产生与伺服控制信号组合以产生控制信号的补偿信号。

公开(公告)号：US06757127B1

公开(公告)日：2004-06-29

申请号：US09648869

申请日：2000-08-25

申请人： Jack Ming Teng ,  Kian Keong Ooi ,  Ming Zhong Ding ,  Wing Kong Chiang ,  Louis Seng Hong Pang ,  Beng Wee Quak

发明人： Jack Ming Teng ,  Kian Keong Ooi ,  Ming Zhong Ding ,  Wing Kong Chiang ,  Louis Seng Hong Pang ,  Beng Wee Quak

IPC分类号： G11B5596

CPC分类号： G11B5/54

摘要： An information handling system, such as a disc drive, includes a base, a disc stack rotatably attached to the base, and an actuator assembly movably attached to the base. A region of the disc stack is identified as a parking band, and when power is not provided to the disc drive, the actuator assembly is held in a parked position within the parking band by an actuator latch. The actuator latch and actuator assembly have different resonant frequencies based on several environmental elements near the actuator assembly, including the temperature of the environment in the disc enclosure. The actuator assembly is unlatched by measuring the environmental element near the actuator assembly and applying an alternating current to a voice coil coupled to the actuator. The frequency of the alternating current applied to the actuator assembly during the unlatching procedure is near the resonant frequency of the actuator assembly in the measured environment.

摘要翻译： 诸如盘驱动器的信息处理系统包括基座，可旋转地附接到基座的盘叠和可移动地附接到基座的致动器组件。 盘片堆叠的区域被识别为停车带，并且当没有向盘驱动器提供动力时，致动器组件通过致动器闩锁保持在停车带内的停放位置。 致动器闩锁和致动器组件基于致动器组件附近的几个环境元件具有不同的谐振频率，包括盘盒中的环境温度。 致动器组件通过测量致动器组件附近的环境元件并将交流电流施加到耦合到致动器的音圈来解锁。 在解锁过程中施加到致动器组件的交流电的频率接近测量环境中的致动器组件的谐振频率。

公开(公告)号：US06721120B2

公开(公告)日：2004-04-13

申请号：US09844159

申请日：2001-04-27

申请人： Shuang Quan Min ,  Kian Keong Ooi ,  Ricky WeiWatt Yeo ,  Chiap Heok Ang ,  Ming Zhong Ding ,  Beng Wee Quak

发明人： Shuang Quan Min ,  Kian Keong Ooi ,  Ricky WeiWatt Yeo ,  Chiap Heok Ang ,  Ming Zhong Ding ,  Beng Wee Quak

IPC分类号： G11B2102

CPC分类号： G11B5/59633

摘要： A method for writing servo information to a disc rotatably mounted to a spindle motor. A measured cage frequency is obtained from a written reference track, from which an actual cage frequency is predicted. The predicted cage frequency is then used to derive compensated position commands. During a servo write interval, the compensated position commands are used to control the head such that the head follows the disc movements caused by the cage frequency.

摘要翻译： 一种将伺服信息写入可旋转地安装在主轴电动机上的盘的方法。 测量的笼式频率从预测实际笼频率的书写参考轨迹获得。 然后使用预测的笼式频率来导出补偿位置命令。 在伺服写入间隔期间，补偿位置命令用于控制磁头，使得磁头跟随由磁盘笼频率引起的磁盘运动。

公开(公告)号：US06574061B1

公开(公告)日：2003-06-03

申请号：US09610202

申请日：2000-07-03

申请人： Khong Mau Ling ,  Lian Chong Kwek ,  Kwee Teck Say ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

发明人： Khong Mau Ling ,  Lian Chong Kwek ,  Kwee Teck Say ,  Myint Ngwe ,  Kah Liang Gan ,  Beng Wee Quak

IPC分类号： G11B503

CPC分类号： G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B33/14 ,  G11B2005/0018 ,  G11B2005/3996

摘要： A process of run-time temperature compensating bias current to a magnetoresistive read head in which a plurality of temperature ranges are defined with associated bias current values. A hysteresis range of temperatures is defined for each boundary between temperature ranges. A bias current value is selected based on the temperature range of the sensed temperature. The process is repeated. If the sensed temperature is in a different temperature range from that previously identified and the measured temperature is not in a hysteresis range at the boundary with the temperature range previously identified, the selected bias current value is based on the presently identified temperature range. If the sensed temperature is in a hysteresis range at the boundary with the temperature range previously.

摘要翻译： 对磁阻读取头的运行时温度补偿偏置电流的过程，其中多个温度范围被定义为具有相关联的偏置电流值。 为温度范围内的每个边界定义温度的滞后范围。 基于感测温度的温度范围选择偏置电流值。 重复该过程。 如果检测到的温度处于与先前识别的温度不同的温度范围内，并且测量的温度在与先前识别的温度范围的边界处不在滞后范围内，则所选择的偏置电流值基于当前识别的温度范围。 如果检测到的温度在先前与温度范围的边界处于滞后范围。

公开(公告)号：US06445653B1

公开(公告)日：2002-09-03

申请号：US09714025

申请日：2000-11-15

申请人： Wei Loon Ng ,  Teck Khoon Lim ,  Beng Wee Quak ,  Wing Hung Chan ,  Myint Ngwe

发明人： Wei Loon Ng ,  Teck Khoon Lim ,  Beng Wee Quak ,  Wing Hung Chan ,  Myint Ngwe

IPC分类号： G11B700

CPC分类号： G11B27/105 ,  G11B5/012 ,  G11B20/10 ,  G11B2005/001 ,  G11B2220/20 ,  G11B2220/2516

摘要： The present invention pertains to an apparatus and method for recording data in a data storage medium. The data storage medium includes a number of discs, each having at least one recording surface. Each recording surface is associated with a read/write head that records and accesses data from the surface. Each recording surface is partitioned into a number of zones. Each zone is vertically aligned with a same zone on each surface of each disc. The zone boundaries on all surfaces of the disc drive are the same. The recording frequency for each zone on all surfaces can differ for each read/write head in order to compensate for a read/write head that cannot meet the BPI error rate threshold.

摘要翻译： 本发明涉及用于在数据存储介质中记录数据的装置和方法。 数据存储介质包括多个盘，每个盘具有至少一个记录表面。 每个记录表面与记录和访问来自表面的数据的读/写头相关联。 每个记录表面被划分成多个区域。 每个区域与每个盘的每个表面上的相同区域垂直对准。 磁盘驱动器的所有表面上的区域边界是相同的。 所有表面上的每个区域的记录频率对于每个读/写头可能不同，以补偿不能满足BPI错误率阈值的读/写头。