Method for estimating position error gain for hard disk drives

Details Method for estimating position error gain for hard disk drives Method for estimating position error gain for hard disk drives

2008-09-03

2010-10-12

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077020, C360S078040

Reexamination Certificate

active

07813076

ABSTRACT:
A hard disk drive with a controller that determines a position error signal gain. The position error signal gain is determined from a total servo loop gain and a function that is defined by a slope of a line of A and B servo bits measured at N off-track positions. The function determines an actual plant gain and thus provides a more accurate position error signal gain.

REFERENCES:
patent: 6046879 (2000-04-01), Hampshire
patent: 6515818 (2003-02-01), Harmer
patent: 7525753 (2009-04-01), DeRosa
patent: 2003/0137906 (2003-07-01), Tang et al.
patent: 2005/0219737 (2005-10-01), Fukushima et al.

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