Probably stone tablets. Once written, no moving parts, and they last thousands of years. And you can find them laying around anywhere for free.
Edit: quick math. If we assume roughly one bit per square mm, you’d need about 24,000 km^2 of stone. So if you happen to be located in Northern Canada, you’re all set.
Probably stone tablets. Once written, no moving parts, and they last thousands of years. And you can find them laying around anywhere for free.
Edit: quick math. If we assume roughly one bit per square mm, you’d need about 24,000 km^2 of stone. So if you happen to be located in Northern Canada, you’re all set.