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A CD-R is recordable (one time) while a CD-RW is rewritable (multiple times).

A CD-R is purchased as a blank CD that can be written on either by copying from an existing CD or creating an image of a CD and writing it to the CD-R. In some cases it is possible to write to a portion of the CD-R and later write to an unwritten part of the CD-R (multi-session). No part of the CD-R can be written to more than once. Another term is WORM, Write Once, Read Many.

A CD-RW can be treated like a CD-R. However, it can also be erased and be written to again many times.

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10y ago

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