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CD-ROM

The term CD-ROM stands for compact-disk read-only memory. CD-ROMs are made of pressed plastic containing a storage layer that holds approximately 700MB of data and can be written to only once. This is the type of media used for audio CD's and computer software disks.

CD-RW

A CD-RW holds the same volume of data, but uses a rewriteable storage media layer and stores roughly the same ammount of data as a CD-ROM.