Sometimes they fail for other reasons as well, such as improper storage.
Back in the 90's to 00's a friend had a collection of cd's that he'd written, but he stored them in a big sleeved folder container. The container itself caused them to warp slightly, which made them unusable.
I took a few for testing and managed to unbend them after some time, which turned them back into a working state.
[Note: That's the most apostrophes I've ever used in a sentence, it feels dirty]
Yeah I didn't want to use heat in case that did more damage, so I just used some weights I had lying around.
If I remember right I just stacked a few starting on the floor with a protective layer in-between so as to not scratch them (a piece of paper is fine). Then add a 5kg or whatever weight on top. After a few days I turned them over and did the same again.
After that most were flat, only one or two needed some more individual time. I imagine that if after that if they're still not flat them maybe heating them slightly in the oven or even just the sun outside might do the trick.
Back in the 90's to 00's a friend had a collection of cd's that he'd written, but he stored them in a big sleeved folder container. The container itself caused them to warp slightly, which made them unusable.
I took a few for testing and managed to unbend them after some time, which turned them back into a working state.
[Note: That's the most apostrophes I've ever used in a sentence, it feels dirty]