Optical disc

optical mediaoptical data storagediscoptical discsdiscsopticaloptical diskglass discsCD/DVDCDs
In computing and optical disc recording technologies, an optical disc (OD) is a flat, usually circular disc which encodes binary data (bits) in the form of pits (binary value of 0 or off, due to lack of reflection when read) and lands (binary value of 1 or on, due to a reflection when read) on a special material (often aluminium ) on one of its flat surfaces.wikipedia
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