In computing and optical disc recording technologies,[1] an optical disc (OD) is a flat, usually circular disc that encodes binary data (bits) in the form of pits and lands on a special material, often aluminum,[2] on one of its flat surfaces. Its main uses are physical offline data distribution and long-term archival. Changes from pit to land or from land to pit correspond to a binary value of 1; while no change, regardless of whether in a land or a pit area, corresponds to a binary value of 0.
Flat, usually circular disc that encodes binary data
This article is about digital storage media such as CDs and DVDs. For a similarly-named anatomic feature of the eye, see optic disc.
"Optical media" redirects here. For transmission media for light, see Optical medium. For broader definition, see optical storage.
This article uses bare URLs, which are uninformative and vulnerable to link rot.(June 2022)
Non-circular optical discs exist for fashion purposes; see shaped compact disc.
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