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CD
The Compact Disc was first implemented commercially for storing digital audio data (CD-Digital Audio). The physical specifications for the 12cm disc, since known as CD have become an international standard. The CD is made up of a polycarbonate substrate, a thin reflective metallic layer (the mirror-like is aluminum), and a lacquer coating. The encoded data track is a continuous spiral track of about 1.6 to 2.2 microns wide, and the pits are about 0.6 microns wide.
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