Information recording medium having dummy tracks and information

Details Information recording medium having dummy tracks and information Information recording medium having dummy tracks and information

1989-11-20

1992-08-11

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 32, 3692753, 369 58, G11B 390, G11B 370, G11B 700

Patent

active

051385996

ABSTRACT:
In a disk-shaped information recording medium using an MCAV format, a plurality of tracks are divided in a radial direction of the disk to form plural zones, at the boundary of which a dummy track area is formed by dummy tracks on which a discrimination signal is recorded. By this provision, the erroneous data recording and reproducing operation in the tracks positioned at both ends of the zone due to crosstalk is prevented. In an information recording and reproducing apparatus, by providing a circuit for correcting the seek distance based on the number of the dummy tracks located between a current track and a target track, correct seek operation is executed. Also, by providing a detector for detecting the discrimination signal and a mechanism to move the head on the dummy track into the zone, erroneous recording and reproducing operation of the data in the dummy track is prevented. Further, by providing a circuit to determine if a write clock to be used for data recording has a prescribed frequency precision, assurance is made to have the frequency precision in coordination with the data recording density in which the write clocks are different between the zones so as to improve reliability of the recorded data.

REFERENCES:
patent: 4519056 (1985-05-01), Kimoto et al.
patent: 4884259 (1989-11-01), Horikawa et al.
JP-63-152598, published 1988 Classified in class 369/275.3 (Abstract only).

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