The "R" found in CD-R and DVD+/-R media stands for recordable. It will tell
consumers that these disks are blank recordable media. You can record
movies, data, music, and photos on the disc, but the discs cannot be erased.
The "RW" on CD-RW and DVD+/-RW media stands for rewritable. This lets you
know that media with RW on them can be recorded and erased several times.
Even though the prices for blank CD and DVD media is inexpensive, you can
expect to pay a bit more for RW type media.
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If you've been shopping for blank CDs or blank DVDs recently, you may have
found yourself a bit confused by all of the choices - CD-R, CD-RW, DVD+R,
DVD-R, DVD-RW, and DVD+RW.