compact disc read-only memorycompact disc read-writecompact disc recordable : FOLDOC

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compact disc read-only memorycompact disc read-writecompact disc recordable ： FOLDOC

Compact Disc Recordable
(CD-R) A write-once version of CD-ROM. CD-Rs can hold about 650 megabytes of data. They are very durable and can be read by normal CD-ROM drives, but once data has been written it cannot be altered.
Standard prerecorded CDs have their information permanently stamped into an aluminium reflecting layer. CD-R discs have a dye-based recording layer and an additional golden reflecting layer.
Digital information is written to the disc by burning (forming) pits in the recording layer in a pattern corresponding to that of a conventional CD.
The laser beam heats the substrate and recording layer to approximately 250 C. The recording layer melts and the substrate expands into the space that becomes available.
{Phillips: New Technologies (http://www-us.sv.philips.com/newtech/cdrewritable.html)}.
See also CD-RW and DVD-RAM.
(1999-08-01)

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