Optical data system and high density optical disk relating thereto

摘要: An apparatus for recording data includes a source of digital arranged into words having given number bits and converter that converts the to code one more bit than using group format. The include binary signal first second values at clock interval determined by rate words. also storage disk surface, drive member rotatably driving disk, laser focused beam, control assembly directing surface so beam accesses plurality concentric tracks on surface. A circuit provides utilized generating energizing pulses duration less when has value. pulse generator applies activate responsive is turned off even does not change value from next. high density optical including in predetermined zones may be conjunction apparatus, which further incorporated an retrieval system.