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System and method for determining head-disk contact in a magnetic recording disk drive having a fly-height actuator
System and method for determining head-disk contact in a magnetic recording disk drive having a fly-height actuator
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机译:用于确定具有飞高致动器的磁记录磁盘驱动器中的磁盘接触的系统和方法
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摘要
In a magnetic recording disk drive, a disk with equally angularly spaced regions that have topography different from the other regions of the disk is used to detect head-disk contact. In one embodiment of a bit-patterned media (BPM) disk, equally angularly spaced servo sectors have topography different from the data regions of the disk. A head-disk spacing sensor detects the topography of the servo sectors as the servo sectors pass the sensor during rotation of the disk. This results in the head-disk spacing sensor generating an output signal with a fundamental frequency f0=NX/60 Hz, where N is the number of servo sectors and X is the disk rotation rate in RPM. A second or higher harmonic or harmonics of the fundamental frequency f0 are filtered from the output of the head-disk spacing sensor and used to identify the initiation of head-disk contact.
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