As a collector of CDs and DVDs for many years (legitimate factory pressed ones), I’ve noticed that some of my older CDs have begun to have little pin-prick-sized transparent holes or dark spots in the information layer. I know this has been known to cause skipping and readability problems. However, so far, all of the discs of mine with this CD rot problem still seem to play fine.
So… obviously, I’m not complaining! What I am wondering though is… scientifically, how is this possible? If there is physical damage to the part of the disc where the data is stored… how do the affected areas still play?