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1. 发明授权

US07423825B2 Disk unit and manufacturing method thereof 失效
标题翻译：磁盘单元及其制造方法
公开(公告)号：US07423825B2
公开(公告)日：2008-09-09
申请号：US11172199
申请日：2005-06-29
申请人： Naoki Shimamura , Osama Takazawa , Kaoru Umemura , Kazuhiko Washizu
发明人： Naoki Shimamura , Osama Takazawa , Kaoru Umemura , Kazuhiko Washizu
IPC分类号： G11B27/36
CPC分类号： G11B5/59605 , G11B5/56 , G11B27/36 , G11B2220/20
摘要： A disk unit is capable of detecting a track, the track width of which deviates from a normal value, with high accuracy at high speed. A HDD includes a read head, a disk and defective-track detecting part. The disk has servo data including bursts A, B written thereon. The servo data is used to position the read head to a track center. The defective-track detecting part detects a defective track as below. The sum of the amplitude of bursts A and B, which have been read by the read head by one read operation, is divided by the amplitude of a burst C or D to obtain a compared value. If the compared value deviates from a criterion by a specified percentage or more, it is judged that the track width of a track is abnormal. Since bursts A through D are written without trimming, the size of bursts A through D in the track width direction are kept constant regardless of the track width. Accordingly, a gap G fluctuating in accordance with the track width is formed in the radial direction between bursts A and B. Bursts A and B are read at a position including gap G, and the above-mentioned compared value is determined, and thereby a defective track is detected.
摘要翻译：磁盘单元能够以高速度高精度地检测轨道宽度偏离正常值的轨道。 HDD包括读取头，盘和缺陷轨迹检测部。磁盘具有写入其上的脉冲串A，B的伺服数据。伺服数据用于将读取头定位到轨道中心。缺陷轨迹检测部分检测如下的缺陷轨迹。由读取头通过一次读取操作读取的脉冲串A和B的幅度之和除以突发C或D的幅度以获得比较值。如果比较值与标准偏差达指定百分比以上，则判断轨道的轨迹宽度异常。由于脉冲串A至D在不进行调整的情况下被写入，所以在轨道宽度方向上的脉冲串A至D的大小与轨道宽度无关。因此，在突发A和B之间沿径向方向形成根据磁道宽度波动的间隙G.在包括间隙G的位置处读取突发A和B，并且确定上述比较值，由此检测到有缺陷的轨迹。

2. 发明申请

US20050286156A1 Disk unit and manufacturing method thereof 失效
标题翻译：磁盘单元及其制造方法
公开(公告)号：US20050286156A1
公开(公告)日：2005-12-29
申请号：US11172199
申请日：2005-06-29
申请人： Naoki Shimamura , Osama Takazawa , Kaoru Umemura , Kazuhiko Washizu
发明人： Naoki Shimamura , Osama Takazawa , Kaoru Umemura , Kazuhiko Washizu
IPC分类号： G11B5/56 , G11B5/596 , G11B27/36
CPC分类号： G11B5/59605 , G11B5/56 , G11B27/36 , G11B2220/20
摘要： A disk unit is capable of detecting a track, the track width of which deviates from a normal value, with high accuracy at high speed. A HDD includes a read head, a disk and defective-track detecting part. The disk has servo data including bursts A, B written thereon. The servo data is used to position the read head to a track center. The defective-track detecting part detects a defective track as below. The sum of the amplitude of bursts A and B, which have been read by the read head by one read operation, is divided by the amplitude of a burst C or D to obtain a compared value. If the compared value deviates from a criterion by a specified percentage or more, it is judged that the track width of a track is abnormal. Since bursts A through D are written without trimming, the size of bursts A through D in the track width direction are kept constant regardless of the track width. Accordingly, a gap G fluctuating in accordance with the track width is formed in the radial direction between bursts A and B. Bursts A and B are read at a position including gap G, and the above-mentioned compared value is determined, and thereby a defective track is detected.
摘要翻译：磁盘单元能够以高速度高精度地检测轨道宽度偏离正常值的轨道。 HDD包括读取头，盘和缺陷轨迹检测部。磁盘具有写入其上的脉冲串A，B的伺服数据。伺服数据用于将读取头定位到轨道中心。缺陷轨迹检测部分检测如下的缺陷轨迹。由读取头通过一次读取操作读取的脉冲串A和B的幅度之和除以突发C或D的幅度以获得比较值。如果比较值与标准偏差达指定百分比以上，则判断轨道的轨迹宽度异常。由于脉冲串A至D在不进行调整的情况下被写入，所以在轨道宽度方向上的脉冲串A至D的大小与轨道宽度无关。因此，在突发A和B之间沿径向方向形成根据磁道宽度波动的间隙G.在包括间隙G的位置处读取突发A和B，并且确定上述比较值，由此检测到有缺陷的轨迹。

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