The discs are entirely compliant with the Blu-Ray spec, there is no “compatibility” mark; anything made in the past 10-15 years should work fine. Your writer may be out of spec?
Apparently original M-Disc DVDs required a more powerful laser than normal, but that is not the case for Blu-Ray.
I ran Linux backups on BD-XL 100GB discs for awhile. I lacked access to space in a salt mine, and the M-DISC media was prohibitively expensive, and unnecessary, since the Linux system, its drives, and its backups have all gone away by now. And nothing of value was lost.
As of the 2020s, there are only 2 licensed manufacturers of M-Discs: Ritek, sold under the Ritek and RiDATA brands, and Verbatim with co-branded discs, marketed as the "Verbatim M-DISC".[14][15]
Depends. There are still barely any options for archival-quality digital media for regular people. M-Disc is one of them. Most of what we have access to has a <30 year shelf life.
Closer to < 10 years for hard drives, SD Cards and USB sticks.
All of the combine controller electronics with the storage medium itself, which is another point of failure, and one not easily repaired. Their lack of electrical isolation from a host, combined with their lack of true write protection, makes them vulnerable during read.
Sadly, 5.25" internal Blu-ray drives are all but extinct now, though USB-C variants are still somewhat readily available with transports from Hitachi-LG.
citation needed. My DVD/Blu-ray writer does not support M-DISC
> may last up to 1000 years
or may not. Who knows ?