STEVE HORRELL / SCIENCE PHOTO LIBRARY STEVE HORRELL / SCIENCE PHOTO LIBRARY
Computer compact disc. Compact disc above the computer tray in which it sits. The disc may contain images, sound and text. It is made of plastic pressed with a series of fine depressions. These pits, representing digital information, are read by a laser. The encoded layer is coated with a film of metal to reflect laser light.
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