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A Compact Disc is a fairly simple piece of plastic, about 1.2 millimeters thick. The CD consists of an injection-molded clear polycarbonate plastic substrate, a thin layer of aluminum, and a  lacquer covering.

Compact Discs, whether audio, playstation, or CD-ROM, are manufactured in the same way using the following processes:

· Injection molding of the optical grade polycarbonate using a hydraulic molding machine.
· Metalizing to create an aluminum reflective surface.
· Lacquering to protect the reflective surface
· Printing of the label on top of the lacquer.
· Then the CD is packaged by automated packaging lines.

During manufacturing (molding), this plastic is injected and impressed with microscopic bumps which are referred to as "pits"arranged as a single, continuous, extremely long spiral track of data. These Pits produce a digital signal which is decoded and converted into a antolog signal in which our ears can pickup after modulating thought a speaker.

The data track are so incredibly small that it is approximately 0.5 microns wide, with 1.6 microns separating one track from the next. (A micron is a millionth of a meter.) And the elongated bumps that make up the track are each 0.5 microns wide, a minimum of 0.83 microns long and 125 nanometers high. (A nanometer is a billionth of a meter.)