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CEDs are conductive vinyl platters that are 30.0 cm (11.8 in) in diameter. To avoid using the metric system to name their discs, they were called "12 [inch] discs" even though they were actually slightly smaller. Each side of the disc has grooves that are about 19 miles long and are 37 times smaller than the grooves on a regular phonograph record. When the disc is playing, it spins at about 450 times per minute and each rotation of the disc contained several frames of audio and visual [information].

To read the disc, a titanium needle was placed very lightly on the outer edge of the disc. A small electric current was then passed thru the center of the needle, where it would touch the bottom of the groove and read the audio [information], which was stored in small holes. The needle would read these by detecting how much air was between the needle and the pit and then the [electronics] of the player would convert these into audio. The visual information was stored in the grooves and were read like a regular phonograph record. As the needle passed over the grooves, it would vibrate and the player would convert the [vibrations] into the pictures.

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