Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A CD-RW (Compact Disc-ReWritable) is a ReWritable optical disc for reWriting. Known as CD-Writable (CD-RW) during its development, CD-RW was introduced in 1997, and was preceded by the CD-MO, which was never commercially released, in 1990. CD-RW discs require a more sensitive laser optics. Also, CD-RWs cannot be read in some CD-ROM drives built prior to 1997. This is why CD-ROM drives of the age must bear a "MultiRead" certification to show compatibility. CD-RW discs need to be blanked before reuse. Different blanking methods can be used, including "full" blanking in which the entire surface of the disc is cleared, and "fast" blanking in which only meta-data areas are cleared: PMA, TOC and pregap, comprising a few percent of the disc.

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