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CD
1- Compact Disc. A 4 3/4", multilayer, polycarbonate-plastic, digital recording medium that can hold data or hi-fi stereo audio. Information is "burned into" a CD by a laser that pits the surface of the reflective recording layer. an optical device in a CD drive reads these "blemishes" as binary data.

2- The international term for main cross-connect. See MC.