CD vs DVD surface, light micrograph

CD vs DVD surface, light micrograph

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Credit: GERD GUENTHER/SCIENCE PHOTO LIBRARY

Caption: CD vs DVD surface. Light micrograph comparing the surface of a compact disc (CD, lower right) with that of a DVD (upper left). Both discs are pressed with a series of fine depressions, or pits, (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, whereas the increased number of pits on the DVD show that it is capable of holding many times the data of a CD. Magnification: x900 when printed 10 centimetres wide.

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Keywords: audio, audio sound, bit, bits, cd, coloured, communication, communications, compact disc, compared, comparing, comparison, data, depressions, digital, digitised, disk, dvd, high-tech, light micrograph, lm, music, pattern, pit, pits, pitted, repeated, sound, storage, surface, technological, technology, vs

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