Worth looking into Millennium Disc or M-DISC[0]. Apparently it's media that can last 1000 years. Thinking of buying two 50GB disks and putting some backup files on them when I have a few coins to drop.
The author explicitly notes that he is testing M-Discs; in fact, for heat, he only tests M-Discs.
The article covers m-disc extensively, not sure why you’re linking Wikipedia here?
BD M-disc is the same as a normal BD-R. The DVD M-disc is the only one worth considering for long time archival storage.
What makes you say that? The article appeared to find a significant difference in the reliability of standard BD-R's and M-Disc BD-R's.
There are two types of BD-Rs, high to low & low to high. One is bad for long term and one is good (something something inorganic), but I forget which is which. From my research online bluray m-disc is just the better one but m-disc branded, apparently not the same stuff as the original m-disc DVD.