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CD-RW discs are usually produced in the most common CD-R disc capacities such as 650 and 700 MB, while smaller and larger capacities are rarer. CD-RW recorders typically handle the most common capacities best.
In theory a CD-RW disc can be written and erased roughly 1000 times, although in practice this number is much lower. CD-RW recorders can also read CD-R discs. When used with traditional recording software, CD-RWs act very much like CD-Rs and are subject to the same restrictions; i.e., they can be extended, but not selectively overwritten, and writing sessions must be closed before they can be read in CD-ROM drives or players. One important difference between R and RW media is that the re-crystallized alloy of RW media will gradually decrystallize over time. Because of this, CD-RWs are not as reliable for long-term storage; however, under recommended storage conditions, CD-RW should have a life expectancy of 25 years or more (as compared to 30+ years for CD-R).
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