Fire-proof safes are generally designed so the internal temperature stays at or below ~350°F. Is there a computer medium I can write that’s likely to survive an extended stay around that temperature? Storage size doesn’t matter too much; a CD would be plenty (although an actual CD would presumably turn to soup).

There are apparently dedicated “fireproof” external hard drives available that do this, and this coincidentally-timed piece suggests I might be able to get closer to what I was thinking in the not-too-distant future: https://www.pcgamer.com/hardware/ssds/researchers-have-developed-a-type-of-flash-memory-storage-that-can-withstand-temperatures-higher-than-the-surface-of-venus/

@anth@a.9srv.net If you can find a UL 150 certified media safe it should stay at or below 150°F which should protect tape, CDs, etc.