Where I live temperatures can reach -30C in winter and 30C in summer, so storing anything “sensible” in a shed is a very bad idea. Everything has to be stored in a controlled environment or it will quickly get moldy and rusty.

However, I kept my old 5.25" diskettes in a box where they were a bit squeezed together and they obviously didn’t like that. It could also just be time. Anyways, a few years ago I decided to copy everything on hard drives and some diskettes are now unreadable.

I waited too long to backup them and now it’s too late for some of them.

And even stored “properly”, I also have burned CDs from the early 2000 that are also unreadable. It’s unfortunate but there’s nothing I can do now, except tonlearn the lesson.

I’m always baffled by people that find old computers stored in barns and still working. Where I am I don’t think they would last more than two winters with this kind of temperature and humidity variation.