I’m kind of shilling in this thread, but M-discs are much better than standard discs - they’re ceramic and physically etched. They have theoretical lifespans over 100 years. It’s close to the glass slides you mentioned, although probably not as durable.
Shout the information into a canyon, the information is stored for however long it takes for the echoes to ebb out
I believe CD/DVD is supposed to last for a long time since the information is stored as a physical feature, and it has a lot of redundancy built in
flash and magnetic storage fades and can more easily get corrupted or damaged
Etching the information into glass slides gives you something that will probably outlive the human species
I’m kind of shilling in this thread, but M-discs are much better than standard discs - they’re ceramic and physically etched. They have theoretical lifespans over 100 years. It’s close to the glass slides you mentioned, although probably not as durable.