Fly on demand in situ clearance measurement concept in hard...

Details Fly on demand in situ clearance measurement concept in hard... Fly on demand in situ clearance measurement concept in hard...

2008-01-08

2008-01-08

Young, Wayne (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S031000, C360S046000

Reexamination Certificate

active

07317590

ABSTRACT:
A method for determining a flying height of a head of a hard disk drive. The disk drive includes a pre-amplifier and an automatic gain control (“AGC”) circuit that are connected to the head. The method includes determining a first automatic gain control value based on AGC values at two delta pre-amplifier gain settings. A second automatic gain control value is determined based on AGC values at two different flying heights. A difference between the flying heights can be determined from the first and second automatic gain control values. If one of the flying heights is set to 0 the difference in gain values is equal to the flying height of the head.

REFERENCES:
patent: 6975467 (2005-12-01), Lewkowicz et al.
patent: 2005/0185312 (2005-08-01), Ueda et al.
patent: 2000195210 (2000-07-01), None

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