CD-R
The recordable Compact Disc, or CD-R, was invented by Sony and Philips as a natural extension of Compact Disc technology. It utilizes photosensitive dye and a laser to write data to a CD in a one-time operation. Upon being written upon, the disc functions much like a normal CD, making it compatible across a wide selection of players. The recordable designation (the "-R" in the name) sets it apart from the rewritable and more expensive CD-RW format. Cd-Rs are most often used for data storage, creating mixtapes for other people to listen to, and other forms of data storage where the contents do not need to be modified after the fact. One issue with most CD-Rs is data degradation over time, especially when exposed to ultraviolet radiation on a regular basis.
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