Methods and apparatus to perform hard-disk drive head...

Details Methods and apparatus to perform hard-disk drive head... Methods and apparatus to perform hard-disk drive head...

2007-08-31

2009-12-29

Olson, Jason C (Department: 2627)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S069000, C360S075000

Reexamination Certificate

active

07639442

ABSTRACT:
Methods and apparatus to perform hard-disk drive head proximity detection in a preamplifier are described. One example method of detecting head position in a hard-disk drive includes obtaining a read signal from a head reading information from a disk; determining a signal envelope of the read signal; comparing the signal envelope to a first threshold to produce a first comparison; filtering the signal envelope; comparing the filtered signal envelope to a second threshold to produce a second comparison; combining the first comparison and the second comparison; and determining if the combination of the first comparison and the second comparison indicates head position oscillation.

REFERENCES:
patent: 5334930 (1994-08-01), Onodera et al.
patent: 5838509 (1998-11-01), Yun
patent: 6310739 (2001-10-01), McEwen et al.
patent: 2006/0012912 (2006-01-01), Jeong

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