CED

CED (short for Capacitance Electronic Disc) was a home media format. Originally conceived in 1964, it was only in production from 1981 to 1986, falling victim to poor planing by RCA and delays due to technological problems, causing the format to fail at its introduction due to competition from VHS and LaserDisc, which by then had been introduced.

While the format resembled, and was sometimes confused with, the contemporary Laserdisc format in product form (both metallic coated discs), the two technologies were incompatible as the CED was optically read out with a stylus, much like a classic audio gramophone record, whereas the Laserdisc was read out with a laser beam.

Only a few Star Trek "Videodiscs" were released before production stopped.