Cool.
But at that point you’re back in the realm of optical discs - no longer readable without technology. (Only microscopes are needed, so Civ2 will be able to read it a century earlier.)
On the other hand if civilization only suffers a Roman Empire-like collapse - most technology still intact - or a more total collapse with a recovery within a few decades - then the current CD-R and DVD-R standards are the better bet. There’ll be a heck of a lot of DVD drives and optical discs still around.
