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    • 1. 发明授权
    • Method to determine temperature dependent write pre-compensation in a hard disk drive
    • 确定硬盘驱动器中与温度相关的写入预补偿的方法
    • US07450326B2
    • 2008-11-11
    • US11095857
    • 2005-03-31
    • Fumitoshi Hidaka
    • Fumitoshi Hidaka
    • G11B27/36G11B5/09
    • G11B5/40G11B5/02G11B20/10194G11B20/10481G11B2005/0013
    • Methods in accordance with the present invention can include determining a plurality of sets of write pre-compensation parameters. At baseline conditions, the hard disk drive can apply a first current and write pre-compensation parameters can be tuned to generate a desired write current waveform that can be applied to the read/write head to generate a magnetic field to define magnetization on the magnetic media. The hard disk drive can then apply a second current and write pre-compensation parameters can be tuned to generate the desired write current waveforms. A plurality of write pre-compensation parameters can then be generated based on the results for a plurality of corresponding temperatures and/or temperature ranges.
    • 根据本发明的方法可以包括确定多组写入预补偿参数。 在基准条件下,硬盘驱动器可以应用第一电流,并且写入预补偿参数可被调谐以产生期望的写入电流波形,该波形可以被施加到读/写头以产生磁场以限定磁化上的磁化 媒体。 然后,硬盘驱动器可以应用第二个电流,并且可以调整写入预补偿参数以产生所需的写入电流波形。 然后可以基于多个对应的温度和/或温度范围的结果来生成多个写入预补偿参数。
    • 2. 发明授权
    • System and method for detecting head instability
    • 用于检测头部不稳定性的系统和方法
    • US07113355B2
    • 2006-09-26
    • US11004157
    • 2004-12-03
    • Fumitoshi Hidaka
    • Fumitoshi Hidaka
    • G11B27/36G11B5/02G11B5/09
    • B82Y10/00G11B5/012G11B5/455G11B27/36G11B2005/001G11B2005/0016G11B2220/20
    • Embodiments of the present invention relate to systems, methods, and computer readable media for calibrating storage devices such as hard drives. A testing system is connected to a group of storage devices that are being prepared for release and eventual sale. Alternately, a storage device may be connected to an end-user system for which it is in use. The storage devices are tested for head instability. A lower frequency test pattern is performed, which induces a stronger magnetic field. A measurement of servo gain control is taken while reading from a disk and compared to a baseline for servo gain control. If the variance is larger than a predetermined amount, then the read/write head is determined to be unstable.
    • 本发明的实施例涉及用于校准诸如硬盘驱动器的存储设备的系统,方法和计算机可读介质。 测试系统连接到正在准备发布和最终销售的一组存储设备。 或者,存储设备可以连接到其正在使用的终端用户系统。 测试存储设备的头部不稳定性。 执行较低频率的测试图案,其产生更强的磁场。 在从磁盘读取时进行伺服增益控制的测量,并与伺服增益控制的基线进行比较。 如果方差大于预定量,则读/写头被确定为不稳定。