You may not even be able to get real MDiscs any more [0] and I'm always extremely dubious of 1000 year lifespans since they're effectively impossible to test.

[0] https://www.reddit.com/r/DataHoarder/comments/yu4j1u/psa_ver...

From the comments of that post:

> Hopefully this can put closure to the speculation. Our organization is a databank and is a big user of mdisc for archiving. We reached out to Verbatim last week about this Media Identification Code (MID) discrepancy. Here is their reply, in their own words ---- "The creator of the MDisc technology- Millenniata went out of business in 2017, they sold the technology to Mitsubishi, who until 2019 owned Verbatim. Due to this, the stamper ID changed, but the formula & the disc materials stayed the same. Mitsubishi sold Verbatim & all the technologies to CMC in December of 2020. Verbatim is the only company authorized to sell the original technology. Any Millenniata discs available were all produced before 2017 when the company shut down and any other brand is not the original technology." ----- So there it is, mdiscs with either the 'VERBAT' or 'MILLEN' prefix are fine. Just different production periods. Cheers.

Ah good catch. One big downside of reddit replacing forums is the default sorting does not make it easy to find late contributions like this.

M-Disc has such low capacity that you'd probably want a robot to burn it which is not cheap.

There are 100 GB BDXL flavors of M-Disc, but yeah definitely not enough for really large amounts of data but large enough to store a good chunk of my photos which is mostly what I'd want to keep around.

Videos would fill that up pretty quick though.

for storage of large volumes of data, mdisc is impractical. for storage of a few very important folders, sure.

note that only the cd-r flavor of mdisc is rated for long lifetime.