I've read that MO is much more stable/reliable than writable DVD/BD. I spent a lot of time tracking down certain Taiyo Yuden discs to try to maximize the chance that I'd be able to read the data from DVD-Rs a couple of years later. I've heard a lot of negative things about BD-R reliability. Did you find that MO was better in terms of lifetime?

Taiyo Yuden DVD recordable media as of a few years ago cost 1 cent more than their renown CD-R media. I don't trust it for anything serious, I barely trust MAM-A Gold DVD-RWs.

I played the MO game in the '90s and found them to be rock solid, and durable as well (e.g. I'd throw a disk cartridge in my backpack without problems). Theoretically they looked quite quite solid.

I get a kick out of the idea that someone would guarantee something beyond their lifespan, and possibly that of the institution. 100 years is still a pretty long time, and lots of things can happen, so I'm not sure who would be there at the 80 year mark if something were to go wrong with the disks.

I guarantee my stone tablets will last 100 years if they are cared for as specified in the user manual.

Am I crazy?

Yes stone is great, but how many bytes/tablet do you get on average?

Are you chiseling in UTF-8 or UTF-16?

"Recall this batch immediately! These disks have a defect that will make them last 80, 90 years tops!"

Even if someone is around, what exactly are they going to do about it? It's not like they can wave a magic wand and get your data back.