Re: old CDs
Music CDs I bought in the 90s are also still perfectly readable
MUSIC CDs, yes, but early data backup CDs will have turned into hazards by now, due to innovation. Early data CDs were made to be written & read at up to 8x speeds compared to music, and that gets very interesting when you stick those in a later 48x speed drive.
It will spin up, fail to read, slow down and speed up again, followed by a shattering sound as the disc disintegrates due to centrifugal forces it was never designed for..