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公开(公告)号：US6151181A
公开(公告)日：2000-11-21
申请号：US353365
申请日：1999-07-15
IPC分类号： G11B5/00 , G11B5/012 , G11B5/455 , G11B5/465 , G11B5/55 , G11B5/596 , G11B19/04 , G11B21/10 , G11B15/12
CPC分类号： G11B21/106 , G11B19/04 , G11B5/455 , G11B5/5547 , G11B2005/0008 , G11B2005/0013 , G11B5/012 , G11B5/59683 , G11B5/59688
摘要： A magnetic disk device of embedded-servo type is capable of performing dummy operation for suppressing waveform degradation of signal reproduced by magnetic heads at a high speed with high reliability. When a waveform deformation occurs in a No.0 head, a controller changes over the No.0 head to a No.1 head operating normally, whereupon a cylinder portion for which dummy operation is to be performed is sought on the basis of the servo information supplied from the No.1 head. The cylinder portion destined for the dummy write operation contains servo information at timing positions that are the same for the individual magnetic heads. When passing of the No.1 head over the cylinder portion is confirmed, the No.1 head is changed over to the No.0 head for performing dummy write operation for suppressing the waveform deformation of the reproduce signal outputted from the No.0 head. Before the timing for succeeding information, the No.1 head is restored by issuing a head change command signal. Because the seek operation is realized exclusively by the magnetic head suffering no abnormality, the dummy write operation for preventing waveform deformation of the reproduced signal outputted from the No.0 head can be realized without fail.
摘要翻译： 嵌入式伺服型磁盘装置能够以高可靠性执行用于抑制由磁头再现的信号的波形劣化的虚拟操作。 当在No.0磁头发生波形变形时，控制器将No.0磁头转换为正常运行的1号磁头，因此在伺服系统的基础上寻求要进行虚拟操作的气缸部分 资料来自1号头。 用于虚拟写入操作的圆筒部分在各个磁头相同的定时位置处包含伺服信息。 当确认了1号头超过气缸部分时，将1号头切换到0号头，进行虚拟写入操作，以抑制从No.0头输出的再现信号的波形变形 。 在成功的信息定时之前，通过发出头改变命令信号恢复1号头。 由于寻道操作仅由没有异常的磁头实现，所以可以无错地实现用于防止从No.0磁头输出的再现信号的波形变形的虚拟写入操作。
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公开(公告)号：US5995310A
公开(公告)日：1999-11-30
申请号：US819089
申请日：1997-03-18
IPC分类号： G11B5/00 , G11B5/012 , G11B5/455 , G11B5/465 , G11B5/55 , G11B5/596 , G11B19/04 , G11B21/10 , G11B15/12
CPC分类号： G11B21/106 , G11B19/04 , G11B5/455 , G11B5/5547 , G11B2005/0008 , G11B2005/0013 , G11B5/012 , G11B5/59683 , G11B5/59688
摘要： A magnetic disk device of embedded-servo type is capable of performing dummy operation for suppressing waveform degradation of signal reproduced by magnetic heads at a high speed with high reliability. When a waveform deformation occurs in a No.0 head, a controller changes over the No.0 head to a No.1 head operating normally, whereupon a cylinder portion for which dummy operation is to be performed is sought on the basis of the servo information supplied from the No.1 head. The cylinder portion destined for the dummy write operation contains servo information at timing positions that are the same for the individual magnetic heads. When passing of the No.1 head over the cylinder portion is confirmed, the No.1 head is changed over to the No.0 head for performing dummy write operation for suppressing the waveform deformation of the reproduce signal outputted from the No.0 head. Before the timing for succeeding information, the No.1 head is restored-by issuing a head change command signal. Because the seek operation is realized exclusively by the magnetic head suffering no abnormality, the dummy write operation for preventing waveform deformation of the reproduced signal outputted from the No.0 head can be realized without fail.
摘要翻译： 嵌入式伺服型磁盘装置能够以高可靠性执行用于抑制由磁头再现的信号的波形劣化的虚拟操作。 当在No.0磁头发生波形变形时，控制器将No.0磁头转换为正常运行的1号磁头，因此在伺服系统的基础上寻求要进行虚拟操作的气缸部分 资料来自1号头。 用于虚拟写入操作的圆筒部分在各个磁头相同的定时位置处包含伺服信息。 当确认了1号头超过气缸部分时，将1号头切换到0号头，进行虚拟写入操作，以抑制从No.0头输出的再现信号的波形变形 。 在成功的信息定时之前，通过发出头改变命令信号恢复1号头。 由于寻道操作仅由没有异常的磁头实现，所以可以无错地实现用于防止从No.0磁头输出的再现信号的波形变形的虚拟写入操作。
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