My oldest CDs are about 10 years old, and many of the old ones exhibit the symptoms that the yahoo article describes. However, it's not any kind of rot that caused it. When I was in high school, I kept all of my CDs in a binder and kept it in the car at all times. After (not so gently) opening and closing the binder over and over, the backs of some of the CDs developed little chips. When flipping pages in the binder, the backs of the CDs on one side would hit the backs of the CDs on the other. The worst affected were the CDs with smooth, shiny backs (pre-black album Metallica CDs for example). Now I know better, and I use the originals for a quick rip and then store them away. Anyway, my point is, I haven't seen any evidence of disk-rot harming my collection, but certain kinds of wear and tear resemble what the article describes.