If you have any other cyanine dye CD-R's (green colour on bottom), I would recommend backing up any of these you wish to keep. Luckily these are hard to come by now, but I use to reguarily use these a few years back and a good portion of mine are now unreadable in most or all drives. I had CD Rot occur on a few phthalocyanine dye discs where the coating seemed to react with the CD inlet as described above. I done weather tests with cyanine dye and phthalocyanine dye (most CD-R's now) discs. I put one of each bottom side up in a sunny window for a few weeks. The cyanine dye disc turned yellow and was completely unreadable. The other disc still read fine. Then I took one of each and placed it on a roof subject to rain, bugs, sun, etc. for three weeks. Most of the coating on the cyanine dye disc flaked off. The other disc had a small amount of flaking, however there was no way I was going to test either in my drive in their weather beaten state!