Method and apparatus for indicating start of servo information o

Details Method and apparatus for indicating start of servo information o Method and apparatus for indicating start of servo information o

1996-05-17

1998-09-22

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 48, 360 53, G11B 5596

Patent

active

058123385

ABSTRACT:
A disk and a disk drive having a servo start mark for identifying a servo-information start position recorded on the disk is provided. The servo start mark has a plurality of bit patterns unused for other areas in servo information. A method for identifying the position of a signal transducer on a disk is also provided in which it is judged that the signal transducer is present at a predetermined position even if an error is present and the error is a one-bit error. This is accomplished by assuming that the position is correct when the following conditions are confirmed: (a) a parity error occurs in a read servo-information bit pattern and (b) read servo-information bit pattern does not coincide with servo information of an adjacent track.

REFERENCES:
patent: 5231545 (1993-06-01), Gold
patent: 5237552 (1993-08-01), Masood et al.
patent: 5293276 (1994-03-01), Dunn et al.
patent: 5442499 (1995-08-01), Emori
patent: 5477103 (1995-12-01), Romano et al.
patent: 5600499 (1997-02-01), Acosta et al.

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