Method and apparatus for determining a transducer's...

Details Method and apparatus for determining a transducer's... Method and apparatus for determining a transducer's...

2006-03-28

2006-03-28

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S075000, C360S077070

Reexamination Certificate

active

07019937

ABSTRACT:
The present invention is directed to method and apparatus for determining a transducer's reference position in a disk drive having a disk surface with spiral servo information written thereon. The transducer comprises a read head for reading spiral servo information and a read signal envelope is generated when the read head reads the spiral servo information. An integration is performed over a first integration window, wherein the first integration window includes a read signal envelope. A reference position is determined for the read head using a second integration window (virtual integration window) that is included within, and smaller than, the first integration window. In one embodiment, the integration may be performed on a frame-by-frame basis. A determination may be made of the frame in the first integration window that includes a maximum sync amplitude. The second integration window may be centered using the frame that includes the maximum sync amplitude.

REFERENCES:
patent: 5668679 (1997-09-01), Swearingen et al.
patent: 6144517 (2000-11-01), Watanabe et al.
patent: 6704156 (2004-03-01), Baker et al.

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