Magnetic disk apparatus having a circuit for detecting a positio

Details Magnetic disk apparatus having a circuit for detecting a positio Magnetic disk apparatus having a circuit for detecting a positio

1992-03-30

1994-05-31

Denion, Thomas E.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7814, G11B 5596

Patent

active

053174615

ABSTRACT:
A magnetic disk apparatus detects servo information on a magnetic disk which includes a plurality of concentric tracks which are provided with an alternate arrangement of data areas and servo areas. The apparatus includes a servo ID detecting circuit which generates a first detection signal when a servo area including an identification signal is detected and a data reproducing circuit which generates a second detection signal when read data pulses are detected on the signal reproduced from the magnetic disk. Sampling pulses are generated when the second detection signal indicates that the generation of read data pulses has terminated, while the first detection signal indicates the presence of the identification signal. The positional error of the magnetic head of the magnetic disk apparatus with respect to the target track of the magnetic disk is determined from the servo information of the signal reproduced from the magnetic disk in synchronism with the sampling pulses.

REFERENCES:
patent: 4875114 (1989-10-01), Moteki
patent: 5023732 (1991-06-01), Murakami et al.
patent: 5027234 (1991-06-01), Kawahara
patent: 5053899 (1991-10-01), Okawa et al.

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