資料來源 : WordNet®
compact disc recordable
n : a compact disc on which you can write only once and
thereafter is read-only memory [syn: {CD-R}, {CD-WO}, {compact
disc write-once}]
資料來源 : Free On-Line Dictionary of Computing
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)