The CD-Rs were around fifteen years old, stored in plastic boxes in my house (in rooms with HVAC). A couple of them failed in a set of twenty or thirty I think.

The CD-Rs were around fifteen years old, stored in plastic boxes in my house (in rooms with HVAC). A couple of them failed in a set of twenty or thirty I think. I do have 20+ year old CD-Rs that still work fine though. For hard drives I have had ones that were mysteriously corrupted after being unused for six years or so, but others that were readable after fifteen. It partially is the luck of the draw.