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1. 发明授权

US06693760B1 Preamplifier circuit configurable to allow simultaneous read and write operations for self-servo writing a disk drive 有权
标题翻译：前置放大器电路可配置为允许同时读写操作，用于自动写入磁盘驱动器
公开(公告)号：US06693760B1
公开(公告)日：2004-02-17
申请号：US09540445
申请日：2000-03-31
申请人： Mohamad T. Krounbi , John Cuda , Jack M. Chue , Robert Leslie Cloke , David Price Turner , Gary L. Dunbar
发明人： Mohamad T. Krounbi , John Cuda , Jack M. Chue , Robert Leslie Cloke , David Price Turner , Gary L. Dunbar
IPC分类号： G11B2102
CPC分类号： G11B5/59633 , G11B5/024
摘要： A preamplifier circuit is disclosed comprising a data input for receiving write data, a read signal output for outputting an amplified read signal, a read signal input for receiving a read signal from a read element, and a write signal output for supplying a write signal to a write element. The preamplifier circuit further comprises a first amplifier circuit, responsive to the write data, for generating the write signal supplied to the write element, and a second amplifier circuit for amplifying the read signal from the read element to generate the amplified read signal output via the read signal output. A head control circuit, responsive to head select data, simultaneously enables the first and second amplifier circuits to perform a simultaneous read and write operation.
摘要翻译：公开了一种前置放大器电路，包括用于接收写入数据的数据输入端，用于输出放大的读取信号的读取信号输出端，用于从读取元件接收读取信号的读取信号输入端和用于将写入信号提供给写元素。前置放大器电路还包括响应于写入数据的第一放大器电路，用于产生提供给写入元件的写入信号，以及第二放大器电路，用于放大来自读取元件的读取信号，以产生经由读信号输出。响应于头部选择数据的头部控制电路同时使第一和第二放大器电路执行同时的读取和写入操作。

2. 发明授权

US06600620B1 Self-servo writing a disk drive by propagating interleaved sets of timing clocks and servo bursts during alternate time intervals 有权
标题翻译：通过在交替时间间隔期间传播交错的定时时钟和伺服脉冲串来自动伺服写入磁盘驱动器
公开(公告)号：US06600620B1
公开(公告)日：2003-07-29
申请号：US09541136
申请日：2000-03-31
申请人： Mohamad T. Krounbi , John Cuda , Jack M. Chue , Robert Leslie Cloke , David Price Turner , Gary L. Dunbar
发明人： Mohamad T. Krounbi , John Cuda , Jack M. Chue , Robert Leslie Cloke , David Price Turner , Gary L. Dunbar
IPC分类号： G11B2102
CPC分类号： G11B5/59644
摘要： The present invention may be regarded as a self-servo writing disk drive comprising a head having a read element radially offset from a write element. During a first time interval, the read element is positioned over a first radial location to read first A clock data to generate first circumferential timing information and first A servo bursts to generate first position control information. The first position control information is used for positioning the write element over a second radial location, and the first circumferential timing information is used for writing second B clock data and second B servo bursts to the second radial location. During a second time interval, the read element is positioned over the first radial location to read first B clock data to generate second circumferential timing information and first B servo bursts to generate second position control information. The second position control information is used for positioning the write element over the second radial location, and the second circumferential timing information is used for writing second A clock data and second A servo bursts to the second radial location.
摘要翻译：本发明可以被认为是包括具有从写入元件径向偏移的读取元件的头的自伺服写入盘驱动器。在第一时间间隔期间，读取元件位于第一径向位置上以读取第一A时钟数据以产生第一周期定时信息和第一A伺服脉冲串以产生第一位置控制信息。第一位置控制信息用于在第二径向位置定位写元件，并且第一周期定时信息用于将第二B时钟数据和第二B伺服脉冲串写入第二径向位置。在第二时间间隔期间，读取元件位于第一径向位置上以读取第一B时钟数据以产生第二周期定时信息和第一B伺服突发，以产生第二位置控制信息。第二位置控制信息用于将写元件定位在第二径向位置上，并且第二周期定时信息用于将第二A时钟数据和第二A伺服脉冲串写入第二径向位置。

3. 发明授权

US06552880B1 Disk drive comprising thermal asperity protection by reducing an electrical bias supplied to a magneto-resistive head 失效
标题翻译：磁盘驱动器通过减少提供给磁阻头的电偏压来包括热绝缘保护
公开(公告)号：US06552880B1
公开(公告)日：2003-04-22
申请号：US09773969
申请日：2001-01-31
申请人： Gary L. Dunbar , David M. Hannon , James Weispfenning , Jodie A. Christner , Timothy Bouwkamp
发明人： Gary L. Dunbar , David M. Hannon , James Weispfenning , Jodie A. Christner , Timothy Bouwkamp
IPC分类号： G11B5127
CPC分类号： G11B5/012 , G11B5/40 , G11B2005/0018
摘要： The present invention may be regarded as a disk drive with protection against damage due to a thermal asperity. The disk drive comprises a disk having a surface with an asperity, and a magneto-resistive head actuated radially over the surface of the disk for generating a read signal comprising a thermal asperity component caused by the magneto-resistive head contacting the asperity on the surface of the disk. A bias generator is provided for generating an electrical bias applied to the magneto-resistive head, and a thermal asperity detector detects the thermal asperity component in the read signal. When the thermal asperity component is detected, the electrical bias is reduced for a time interval, thereby protecting the magneto-resistive head.
摘要翻译：本发明可以被认为是具有防止由于热不均匀而损坏的盘驱动器。盘驱动器包括具有凹凸表面的盘，以及在盘的表面上径向地致动的磁阻头，用于产生读信号，该读信号包括由磁阻头与表面上的凹凸接触而引起的热凹凸分量的磁盘。提供偏置发生器用于产生施加到磁阻头的电偏压，并且热凹凸检测器检测读信号中的热凹凸分量。当检测到热凹凸分量时，电偏压一段时间减小，从而保护磁阻头。

4. 发明授权

US06525892B1 Method of calibrating a write current-setting for servo writing a disk drive 有权
标题翻译：校准用于伺服写入磁盘驱动器的写入电流设置的方法
公开(公告)号：US06525892B1
公开(公告)日：2003-02-25
申请号：US09493751
申请日：2000-01-28
申请人： Gary L. Dunbar , Yoo H. Kim , Hanan Kupferman , Brian Tanner , David P. Turner
发明人： Gary L. Dunbar , Yoo H. Kim , Hanan Kupferman , Brian Tanner , David P. Turner
IPC分类号： G11B2736
CPC分类号： G11B5/59605 , G11B5/59633 , G11B2005/001 , G11B2005/0013
摘要： A method of calibrating a write current-setting for writing servo sectors onto a recording surface through a head in a head disk assembly of a disk drive is disclosed. A preamplifier circuit has an input for receiving a selected control signal set by a current-setting value, the preamplifier circuit causing current to flow through the head with a current magnitude determined by the current-setting value. A multiple-pass process is performed in which a series of current-setting values are set for the control signal for generating a plurality of quality metrics each indicative of a quality of the selected control signal. Each pass in the multiple-pass process includes the steps of providing a data sequence to the preamplifier circuit to cause a test pattern to be written to the recording surface, and reading the test pattern and generating and storing at least one of the plurality of quality metrics. The generated and stored quality metrics are then evaluated to select a current-setting value for the selected control signal. The selected current-setting value is then set for the head, and the servo sectors are written onto the recording surface through the head.
摘要翻译：公开了一种通过磁盘驱动器的磁头盘组件中的磁头校准用于将伺服扇区写入记录表面的写入电流设置的方法。前置放大器电路具有用于接收由电流设定值设定的选定控制信号的输入端，该前置放大器电路使电流以由电流设定值确定的电流大小流过磁头。执行多遍处理，其中为控制信号设置一系列电流设定值，用于产生指示所选择的控制信号的质量的多个质量度量。多遍处理中的每次通过包括以下步骤：向前置放大器电路提供数据序列以使测试图案被写入到记录表面，并且读取测试图案并生成和存储多个质量中的至少一个指标然后评估生成和存储的质量度量以选择所选控制信号的电流设定值。然后为磁头设置所选的电流设定值，并通过磁头将伺服扇区写入记录表面。

5. 发明授权

US06310740B1 Disk drive including N-current preamplifier for generating N-independently controlled write currents 有权
标题翻译：磁盘驱动器包括用于产生N个独立控制的写入电流的N电流前置放大器
公开(公告)号：US06310740B1
公开(公告)日：2001-10-30
申请号：US09342670
申请日：1999-06-29
申请人： Gary L. Dunbar , Brian Tanner , David P. Turner
发明人： Gary L. Dunbar , Brian Tanner , David P. Turner
IPC分类号： G11B509
CPC分类号： G11B5/59633 , G11B5/012 , G11B5/035 , G11B5/09 , G11B20/10 , G11B2005/001 , G11B2005/0013
摘要： A disk drive comprising a plurality of recording surfaces and plurality of associated heads is disclosed employing a n-current preamplifier for generating n independently controlled write currents. For example, the n-current preamplifier may be employed during manufacturing of the disk drive to simultaneously write servo sectors to all of the recording surfaces in a “bank servo write” mode. The n-current preamplifier comprises an input for receiving a plurality of current-setting control signals corresponding to the plurality of heads, and a plurality of signal-to-current converters for converting the current-setting control signals into a plurality of write currents for the heads, wherein each write current has a magnitude that is independently controlled by a respective one of the current-setting control signals. The optimal write current for each head is determined during a calibration mode wherein a test pattern is written to and read from the disk to generate a quality metric indicative of the quality of the write current setting. Several write current settings are tested for each head, and the write current that generates the best quality metric for each head is used to simultaneously write the servo sectors to the recording surfaces.
摘要翻译：公开了一种包括多个记录表面和多个相关联的磁头的磁盘驱动器，其采用n电流前置放大器来产生n个独立控制的写入电流。例如，在磁盘驱动器的制造期间可以采用n电流前置放大器，以“库伺服写入”模式同时将伺服扇区写入所有记录表面。 n电流前置放大器包括用于接收与多个磁头相对应的多个电流设定控制信号的输入端和用于将电流设定控制信号转换成多个写入电流的多个信号到电流转换器，磁头，其中每个写入电流具有由相应的一个电流设定控制信号独立地控制的幅度。在校准模式期间确定每个头的最佳写入电流，其中将测试图案写入到盘并从盘读取，以产生指示写入电流设置的质量的质量度量。为每个头测试多个写入当前设置，并且为每个头生成最佳质量度量的写入电流用于同时将伺服扇区写入记录表面。

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