what is drawn to store data in CD -ROMS
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The surface of a CD is made of a polycarbonate layer with molded spiral tracks on the top. The data are stored on the CD as a series of minute grooves which are known as 'pits' encoded on these spiral tracks. The areas between the 'pits' are known as 'lands'.
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Like a CD, the data on a DVD is encoded in the form of small pits and bumps in the track of the disc. A DVD is composed of several layers of plastic, totaling about 1.2 millimeters thick. Each layer is created by injection molding polycarbonate plastic. ... Each writable layer of a DVD has a spiral track of data.
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