Disk apparatus for detecting address marks from a recording disk

Details Disk apparatus for detecting address marks from a recording disk Disk apparatus for detecting address marks from a recording disk

1994-09-13

1997-04-22

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 50, 369 58, G11B 700

Patent

active

056234686

ABSTRACT:
Disk apparatus for detecting address marks in the data of a zoned constant angular velocity (ZCAV) recording disk. The apparatus includes a detecting unit for detecting sector marks in the data. Time delay circuitry establishes a time delay between sector mark detection and an address mark detecting gate period. A portion of the time delay is established by a pulse count which is independent of the reproducing frequency corresponding to the zone of the sector mark. A second portion of the time delay is established responsive to the recording frequency. The time delay so established is used to position the address mark detecting period to reliably detect the address mark.

REFERENCES:
patent: 5432762 (1995-07-01), Kubo et al.

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