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    • 45. 发明授权
    • Method of determining the variation of the clearance between a magnetic transducer and a recording media during track seeking
    • 在寻轨期间确定磁换能器和记录介质间隙的变化的方法
    • US06611389B1
    • 2003-08-26
    • US09414385
    • 1999-10-07
    • Bo LiuQisuo Chen
    • Bo LiuQisuo Chen
    • G11B2736
    • G11B5/6005G11B5/012G11B27/36G11B2005/001
    • A method of determining a clearance between a magnetic transducer and a magnetic recording medium during a track seeking operation, the magnetic recording medium being moveable with respect to the transducer and including at least a test track and a reference track, which method comprises the steps of: at least partially erasing a predetermined area of the recording medium including at least one test track and one reference track; writing a first series of predetermined magnetic transitions along a spiral trace, formed by seeking operation of the transducer, on the at least one test track in the predetermined area; reading the test track and obtaining a pulse width of signals read back from the test track (test track pulse width) at a predetermined amplitude level; writing a further series of predetermined magnetic transitions identical to the first series on a reference track of the recording medium in the predetermined area; reading the reference track and obtaining, a pulse width of signals read back from the reference track (reference track pulse width) at the predetermined amplitude level; and calculating the difference between the test track pulse width and the reference track pulse width, said difference being indicative of the clearance between the magnetic transducer and the magnetic recording medium during track seeking.
    • 一种在轨迹寻找操作期间确定磁换能器和磁记录介质之间的间隙的方法,所述磁记录介质可相对于所述换能器移动并且至少包括测试轨道和参考轨道,所述方法包括以下步骤: :至少部分地擦除包括至少一个测试轨道和一个参考轨道的记录介质的预定区域; 沿着预定区域的至少一个测试轨迹沿着通过寻找换能器的操作形成的螺旋迹线写入第一系列预定磁转变; 读取测试轨迹并获得以预定幅度水平从测试轨迹读回的信号的脉冲宽度(测试轨迹脉冲宽度); 在预定区域中在记录介质的参考轨道上写入与第一系列相同的另一系列预定磁转变; 读取参考轨道并获得在预定振幅水平从参考轨道读回的信号的脉冲宽度(参考轨迹脉冲宽度); 以及计算所述测试轨迹脉冲宽度和所述参考轨道脉冲宽度之间的差异,所述差异指示在磁道寻找期间所述磁性换能器与所述磁性记录介质之间的间隙。