16 Facts About CD

CD data is represented as tiny indentations known as pits, encoded in a spiral track moulded into the top of the polycarbonate layer.

The track on the CD begins at the inside and spirals outward so a disc played from beginning to end slows its rotation rate during playback.

Digital data on a CD begins at the center of the disc and proceeds toward the edge, which allows adaptation to the different sizes available.

Logical format of an audio CD is described in a document produced in 1980 by the format's joint creators, Sony and Philips.

CD + Extended Graphics is an improved variant of the Compact Disc + Graphics format.

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Super Audio CD is a high-resolution, read-only optical audio disc format that was designed to provide higher-fidelity digital audio reproduction than the Red Book.

The SACD standard is referred to as the Scarlet Book standard.

CD-MIDI is a format used to store music-performance data, which upon playback is performed by electronic instruments that synthesize the audio.

Video CD is a standard digital format for storing video media on a CD.

The VCD standard was created in 1993 by Sony, Philips, Matsushita, and JVC and is referred to as the White Book standard.

Super Video CD is a format used for storing video media on standard compact discs.

SVCD was intended as a successor to VCD and an alternative to DVD-Video and falls somewhere between both in terms of technical capability and picture quality.

Recordable audio CD is designed to be used in a consumer audio CD recorder.

The Recordable Audio CD is typically somewhat more expensive than CD-R due to lower production volume and a 3 percent AHRA royalty used to compensate the music industry for the making of a copy.

CD-RW is a re-recordable medium that uses a metallic alloy instead of a dye.

The ReWritable Audio CD is typically somewhat more expensive than CD-R due to lower volume and a 3 percent AHRA royalty used to compensate the music industry for the making of a copy.