Magnetic disk apparatus having a circuit for detecting the posit

Details Magnetic disk apparatus having a circuit for detecting the posit Magnetic disk apparatus having a circuit for detecting the posit

1989-09-27

1991-06-11

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7702, G11B 5596

Patent

active

050237322

ABSTRACT:
A magnetic disk apparatus has a circuit for detecting the recorded position of servo information, used for aligning a magnetic head, on a target track of a magnetic disk. The circuit discriminates the track's data area and the servo information area by determining an amplitude difference between detection signals equal or close to a discrimination frequency and the harmonic component of the discrimination frequency. If the amplitude difference exceeds a predetermined value, a servo area is discriminated. If the value is lower than the threshold, a data area is discriminated.

REFERENCES:
patent: 4188646 (1980-02-01), Sordello et al.
patent: 4549232 (1985-10-01), Axmear et al.

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