MDiscs are ISO rated for hundreds to thousands of years.
https://www.ecma-international.org/wp-content/uploads/ECMA-379_3rd_edition_june_2010.pdf
Rated for, but that doesn’t mean they’re all actually manufactured to that standard.
CDs were rated for like 50+ years originally I think. We found out real quick that was an optimistic number, especially when you buy the cheapest thing around.
ISO certification does require a bit more effort than just the bare minimum necessary to legally advertise specific claims about a product.
That doesn’t mean all M-Disc manufacturing is immune to shitty business practices of a manufacturer, but they do have to meet certain manufacturing specifications.
The international organization for standardization has rated them for archival use in the hundreds of years. This is not a maybe and the Wikipedia page/link I shared above goes over the testing methodology
“Archival use” means a commercial climate controlled environment. Not a plastic tub in your basement or garage.
