It’s one disc that has played before many times and couldn’t play again. My fear is that others might do the same thing at some point so maybe I should at least back them up.
But the one that doesn’t play might I have better luck with a different player? I see external drives that are $60 and others that are closer to $200.
I have cleaned the disk with distilled water and non-abrasive cloth and also clean the blu-ray player with a special cleaning desk.