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Wikipedia

CD-R

CD-R (Compact Disc-Recordable) is a digital optical disc storage format. A CD-R disc is a compact disc that can be written once and read arbitrarily many times.

CD-R disks (CD-Rs) are readable by most plain CD readers, i.e., CD readers manufactured prior to the introduction of CD-R. This is an advantage over CD-RW, which can be re-written but cannot be played on many plain CD readers.

The Collaborative International Dictionary

CD-R

CD-R \CD-R\ n. [from Compact Disk-Recordable.] a recordable compact disk; a compact disc on which you can write only once and thereafter is read-only.

Syn: compact disc recordable, CD-WO, compact disc write-once.

Wiktionary

cd-r

n. compact disk - read-only or compact disk - recordable; a form of digital media that is based on the use of a laser to read from a plastic disc. It can only be written to once.