Magnetic disk apparatus having a read/write control circuit

Details Magnetic disk apparatus having a read/write control circuit Magnetic disk apparatus having a read/write control circuit

1990-05-29

1992-10-06

Severin, David J.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

G11B 1504

Patent

active

051537842

ABSTRACT:
A magnetic disk apparatus for reading and writing user's data from a magnetic disk having a data surface with a plurality of concentric data tracks the data surface having a void area in which user's data is inhibited. The magnetic disk apparatus includes a magnetic head for reading and writing the user's data from and to the data tracks, detecting apparatus for detecting a circumferential position of the magnetic head at a target track, a store for storing the position and length of the void area, a timing clock generator for generating a read/write synchronization signal and control circuitry for preventing transmission of the read/write synchronization signal during a time period corresponding to the length of the void area when the circumferential position of the magnetic head corresponds to the position of the void area, thereby inhibiting read-out or write-in to or from an interface circuit while transmission of read/write synchronization signal is prevented.

REFERENCES:
patent: 4405952 (1983-09-01), Slakmon
patent: 4774700 (1988-09-01), Satoh et al.
patent: 4839753 (1989-06-01), Ide et al.
patent: 4841384 (1989-06-01), Murakami et al.
patent: 4885735 (1989-12-01), Fukushima et al.

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