This paper describes a wideband optical disc, digital recorder/playback system, the disc itself, test results, applications and future improvements. Recording is accomplished with a modulated laser beam, positioned on the disc by a track mirror and a focus lens. Playback is done at a reduced constant light level. A servo maintains precision focus of the laser spot on the microscopically uneven disc surface. Fine tracking is obtained by a dither track servo. A trilayer antireflection disc structure provides high optical and thermal efficiency, very high sensitivity and signal to noise ratio, and has the potential for low fabrication cost. Record/playback data rates of 50 Mb/s and data densities of 1011 bits per disc side have been demonstrated. Optical disc configurations have been developed for three applications: a 400 Mb/s recorder/reproducer (using eight 50 Mb/s channels), and a 1013 bit jukebox reader, and a 1014 bit mass memory system (with a 3-second access time to any data record). Future systems will use laser diodes for both record and playback, allowing more compact designs with greater reliability and lower cost.