Data storage device detecting free fall condition from disk speed variations

摘要

A data storage device is disclosed comprising a disk comprising data, and a head actuated over the disk. A timing signal is generated by reading the data from the disk, and a frequency generator is adjusted based on the timing signal to generate a disk locked clock substantially synchronized to a rotation speed of the disk. A free fall condition is detected based on the timing signal, and when the free fall condition is detected the head is parked.

主权项

1. A data storage device comprising:
a disk comprising data; a head actuated over the disk; and control circuitry configured to:
generate a timing signal by reading the data from the disk;adjust a frequency generator based on the timing signal to generate a disk locked clock substantially synchronized to a rotation speed of the disk;detect a free fall condition based on the timing signal; andpark the head when the free fall condition is detected.