Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Reexamination Certificate
2006-05-23
2006-05-23
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
C360S077020, C360S078040, C318S560000, C318S254100
Reexamination Certificate
active
07050257
ABSTRACT:
A method for estimating resistance of a DC motor for positioning read/write heads of a data storage disk is provided. The DC motor is controlled in an open-loop voltage mode through a motor controller input with a first signal for compensating positioning of the read/write heads onto the data storage disk. The first signal is generated based upon a position error signal representing a difference between a position of the read/write heads and a center of a track to be read. The method includes monitoring the first signal during a read operation of data being stored on the data storage disk, and estimating the resistance based upon spectral components of the first signal.
REFERENCES:
patent: 6873489 (2005-03-01), Ho et al.
patent: 2005/0013037 (2005-01-01), Tanner
patent: 2005/0237052 (2005-10-01), Chan
Boscolo Michele
Maiocchi Giuseppe
Marcassa Federico
Oboe Roberto
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Jorgenson Lisa K.
Sniezek Andrew L.
STMicroelectronics S.r.l.
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