If you’ve tried listening to any of your old CDs lately, if you even own them anymore, you may have noticed they won’t play. That’s what happened to mine, anyway.
The last time I played through *all* of my CDs (1500) I found about 10 with unplayable parts, and 2 that were completely unusable.
One of the “damaged” CDs was actually harmed by the marker used to put info on it – the part where the ink was had become completely transparent.