Optical disc with servo pattern providing enhanced reliability o

Details Optical disc with servo pattern providing enhanced reliability o Optical disc with servo pattern providing enhanced reliability o

1990-05-21

1992-05-26

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 32, 369 50, 369124, 3692753, G11B 712

Patent

active

051174120

ABSTRACT:
An optical disc having a plurality of information tracks. Each information track having a data field including multiple data bytes and a servo field including a first servo byte having a pair of wobbled pits and a second servo byte having a clock pit. The byte length of at least one of the first or second servo bytes being longer than the byte lengths of the data bytes. The increased byte length providing for greater distance between the wobbled pits and the clock pit resulting in increased reliability in clock pit detection. An accessing apparatus for accessing such an optical disc including a phase-locked loop circuit with a frequency dividing ratio that varies in accordance with the various byte lengths.

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patent: 4914645 (1990-04-01), Getreuer et al.

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