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A pattern on the base of APS film cartridges that tells the camera the film speed and number of exposures, so when loading a film you don't have to worry about getting it wrong. Or, in a more general sense, a data disc can be any disc with electronic files on it.
A CD that can be used only once to write data on using a CD-Writer.
This looks just like an audio CD and is used to carry up to 740MB of computer data, including images and software.
A CD that can be re-used to write data on using a CD-Rewriter.