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1. 发明授权

US07450326B2 Method to determine temperature dependent write pre-compensation in a hard disk drive 失效
标题翻译：确定硬盘驱动器中与温度相关的写入预补偿的方法
公开(公告)号：US07450326B2
公开(公告)日：2008-11-11
申请号：US11095857
申请日：2005-03-31
申请人： Fumitoshi Hidaka
发明人： Fumitoshi Hidaka
IPC分类号： G11B27/36 , G11B5/09
CPC分类号： G11B5/40 , G11B5/02 , G11B20/10194 , G11B20/10481 , G11B2005/0013
摘要： 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.
摘要翻译：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

US07113355B2 System and method for detecting head instability 有权
标题翻译：用于检测头部不稳定性的系统和方法
公开(公告)号：US07113355B2
公开(公告)日：2006-09-26
申请号：US11004157
申请日：2004-12-03
申请人： Fumitoshi Hidaka
发明人： Fumitoshi Hidaka
IPC分类号： G11B27/36 , G11B5/02 , G11B5/09
CPC分类号： B82Y10/00 , G11B5/012 , G11B5/455 , G11B27/36 , G11B2005/001 , G11B2005/0016 , G11B2220/20
摘要： 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.
摘要翻译：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。

3. 发明申请

US20060119963A1 System and method for detecting head instability 有权
公开(公告)号：US20060119963A1
公开(公告)日：2006-06-08
申请号：US11004157
申请日：2004-12-03
申请人： Fumitoshi Hidaka
发明人： Fumitoshi Hidaka
IPC分类号： G11B27/36 , G01R33/12
CPC分类号： B82Y10/00 , G11B5/012 , G11B5/455 , G11B27/36 , G11B2005/001 , G11B2005/0016 , G11B2220/20
摘要： 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.

4. 发明申请

US20060221487A1 Method to determine temperature dependent write pre-compensation in a hard disk drive 失效
标题翻译：确定硬盘驱动器中与温度相关的写入预补偿的方法
公开(公告)号：US20060221487A1
公开(公告)日：2006-10-05
申请号：US11095857
申请日：2005-03-31
申请人： Fumitoshi Hidaka
发明人： Fumitoshi Hidaka
IPC分类号： G11B21/02 , G11B27/36
CPC分类号： G11B5/40 , G11B5/02 , G11B20/10194 , G11B20/10481 , G11B2005/0013
摘要： 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.
摘要翻译：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。

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