A disk in which light is the medium used to record and read data. The disk is made of clear polycarbonate plastic, covered with a layer of dye, a thin layer of gold which reflects the laser beam, and a protective layer over that. A recording is made by sending pulses from a laser beam which make a pattern in the layer of dye. The recording is read later by directing a laser beam at the disk and interpreting the pattern of reflected light. CDs, CD-ROMs, and DVDs are examples of optical disks.
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Notes and References By K. Eric Drexler
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