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    • 3. 发明授权
    • Method of calibrating a write current-setting for servo writing a disk drive
    • 校准用于伺服写入磁盘驱动器的写入电流设置的方法
    • US06525892B1
    • 2003-02-25
    • US09493751
    • 2000-01-28
    • Gary L. DunbarYoo H. KimHanan KupfermanBrian TannerDavid P. Turner
    • Gary L. DunbarYoo H. KimHanan KupfermanBrian TannerDavid P. Turner
    • G11B2736
    • G11B5/59605G11B5/59633G11B2005/001G11B2005/0013
    • 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.
    • 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。
    • 4. 发明授权
    • Disk drive including N-current preamplifier for generating N-independently controlled write currents
    • 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
    • US06310740B1
    • 2001-10-30
    • US09342670
    • 1999-06-29
    • Gary L. DunbarBrian TannerDavid P. Turner
    • Gary L. DunbarBrian TannerDavid P. Turner
    • G11B509
    • G11B5/59633G11B5/012G11B5/035G11B5/09G11B20/10G11B2005/001G11B2005/0013
    • 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.
    • 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。
    • 5. 发明授权
    • Hybrid method of determining a fractional track position of a read
transducer in a hard disk drive
    • 确定硬盘驱动器中读取换能器的分数轨道位置的混合方法
    • US6122133A
    • 2000-09-19
    • US99485
    • 1998-06-17
    • Ara W. NazarianBrian TannerRichard K. Wong
    • Ara W. NazarianBrian TannerRichard K. Wong
    • G11B5/596
    • G11B5/59655G11B5/59611
    • A method used to implement a sampled servo control system in a magnetic disk drive for generating a fractional track portion of a position error signal to correctably maintain the alignment of a read transducer (or associated write transducer) relative to a centerline of one of a plurality of a concentric data tracks upon a rotating data storage disk. The system uses a hybrid approach of determining a fractional track position by using a two-burst algorithm when possible and using a multi-burst algorithm only when necessary. The system is particularly suited to determining fraction track position when jogging a relatively narrow magnetoresistive read transducer with a servo pattern normally useful only for wider transducers, namely a pattern of four angularly sequential servo bursts A, B, C, D that are 100% of a track pitch in width and are arranged in quadrature. In this context, the preferred system reads all four 100% servo bursts and then uniquely selects between a two-burst algorithm and a four-burst algorithm to generate a fractional track position relative to a two-burst centerline (A/B or C/D) or a four-burst centerline (N-Q or N+Q). In general, the servo system selects between the two-burst and the four-burst algorithms based on the transducer's passing through a two-burst zone or a four-burst zone, which preferably overlap, as determined from the relative burst amplitudes of all four servo bursts. When operating at a position in which the zones overlap, the preferred system is biased to select the zone corresponding to the algorithm used during the immediately previous servo sample in order to add stability.
    • 一种用于在磁盘驱动器中实现采样的伺服控制系统的方法,用于产生位置误差信号的分数轨迹部分,以便可修正地维持读取换能器(或相关联的写入传感器)相对于多个中心线的中心线的对准 的同心数据磁道在旋转数据存储盘上。 该系统使用混合方法,在可能时使用双脉冲串算法来确定分数轨道位置,并且仅在必要时使用多突发算法。 该系统特别适用于通过伺服模式点动相对较窄的磁阻读取换能器时,确定分数轨道位置,该伺服模式通常仅适用于较宽的换能器,即四个角度顺序的伺服脉冲串A,B,C,D的模式为100% 宽度的轨道间距并且正交布置。 在这种情况下,优选的系统读取所有四个100%的伺服脉冲串,然后在双脉冲串算法和四脉冲串算法之间唯一地选择相对于两脉冲中心线(A / B或C / D)或四突发中心线(NQ或N + Q)。 通常,伺服系统基于换能器通过双脉冲区或四脉冲区,在双脉冲串和四脉冲串算法之间进行选择,该脉冲区或四脉冲区优选重叠,从所有四个脉冲的相对突发幅度确定 伺服突发。 当在区域重叠的位置操作时,优选系统被偏置以选择对应于在紧接的前一个伺服样本期间使用的算法的区域,以增加稳定性。