公开(公告)号：US06671110B2

公开(公告)日：2003-12-30

申请号：US09776360

申请日：2001-02-02

申请人： Sachiyo Baba ,  Yukio Fukushima ,  Hidetsugu Tanka ,  Tetsuo Ueda

发明人： Sachiyo Baba ,  Yukio Fukushima ,  Hidetsugu Tanka ,  Tetsuo Ueda

IPC分类号： G11B2736

CPC分类号： G11B21/21 ,  G11B5/012 ,  G11B5/6029

摘要： A method and apparatus for detecting an abnormal fly height of a magnetic head. The method includes reproducing a servo signal recorded on a magnetic disk in advance by the magnetic head when a write operation for writing data on the magnetic disk by the magnetic head is initiated. Next, the gain of the servo signal based on the head part of the servo signal reproduced by the magnetic head is determined. The gain of the servo signal is then compared with a reference value to detect an abnormal fly height of the magnetic head. In an advantageous embodiment, the reference value is the gain of a servo signal determined when the fly height of the magnetic head is normal. Alternatively, in other advantageous embodiments, the reference value is based on the gain of a previous servo signal.

摘要翻译： 一种用于检测磁头的异常飞行高度的方法和装置。 该方法包括当通过磁头写入磁盘上的数据的写入操作时，由磁头预先再现记录在磁盘上的伺服信号。 接下来，确定基于由磁头再现的伺服信号的头部的伺服信号的增益。 然后将伺服信号的增益与参考值进行比较，以检测磁头的异常飞行高度。 在有利的实施例中，参考值是当磁头的飞行高度正常时确定的伺服信号的增益。 或者，在其他有利的实施例中，参考值基于先前伺服信号的增益。