Here's a link to an article describing a phenomenon I first heard of some years ago:
http://www.nature.com/nsu/010628/010628-11.html.
Looks like this fungus can destroy a CD-R or a pressed CD with equal facility. I wouldn't get in a panic, however, unless you live in a rain forest in Central America.
BTW, lest any vinyl fans yuck it up about the "perfect sound forever" rotting away like this, a very similar fungus has been indentified that can munch LPs the same way. Of course, I'm sure the LPs taste much "smoother" going down!
