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How do optical discs vary?

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Optical disks include compact discs (CDs and CD-ROMs), laser discs (see videodisc ), and digital versatile discs (or digital video discs; DVDs and DVD-ROMs). WORM [ W rite O nce/ R ead M any] disks can be used to record data, but once data is recorded it cannot be altered except by obliterating the old version and storing the new version on a previously unused portion of the disk.

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Get more facts and information about optical disk . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

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