GERD GUENTHER / SCIENCE PHOTO LIBRARY GERD GUENTHER / SCIENCE PHOTO LIBRARY
Compact disc surface. Light micrograph of the surface of a compact disc (CD). The plastic disc is pressed with a series of fine depressions (dots) representing a digitised musical signal capable of being read by a laser. Each depression is either long or short, and represents a bit. Eight bits form a byte. CDs can hold millions of bytes of data. Magnification: x900 when printed 10 centimetres wide.
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