@LinaSeiche
They say he has a whole BTC
Long gone times

Yep.... for sure... harder and harder to get a whole coin... and even a year ago (or less) it was way more possible to get a whole coin, but funny how times (and options) change, and so quickly.
I will write one hundred times
That sounds like advices.
unsolicited, toooooooooand we also had that at the time ... for the younger ones among us, this is a 5 1/4 inch disk

would actually make a very good coldwallet, wouldn't it?

1. You'd have a hard time getting hardware or equipment to read anything from that.
2. Storage is limited to either 360k (180k if one sided) up to maybe 1.2mb?
3. That thing is not really water resistant or fire resistant, easily crushed or destroyed.
I like the idea though, it's not much better than a paper wallet.
Given the readability issues, a paper wallet (or even writing down seed words on paper or some other medium of storing keys in analogue form) seems way more reliable than data on a 5 1/4 disc.. Should be obvious, no? And with the analogue format, it can be kept in more than one location, too.... just like multiple 5 1/4 floppies can be made - but you still have the readability problem if backups are in the same format.. but might not be the same problem with other analogue such as key or seed words written or kept on some other analogue medium.