CD-RW
The CD-RW, or Compact Disc Rewritable, is a type of recordable Compact Disc that can be written on multiple times. This is accomplished through the use of a laser and a phase changing alloy in the disc that can revert between a blank state and written state with relative ease. Due to this difference in composition, they require more modern CD drives than CDs or CD-Rs in order to be read from. They are most often used for back-ups, although their relatively low capacity (700 MB) and low rewrite cycles (1000 instead of 10,000 or 100,000) makes them less suited to it than large external drives or DVD-RWs.
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