External DVD/CD

[Arwen]

My next disc burn is going to be a 25GByte M-Disc, which will use ZFS as the file system. I'll likely use "copies=2" for my important stuff, (writings, source, blog, etc...).
It will be a test of ZFS on R/O media. With ZFS I can run a "scrub" to verify contents. (Just can't fix problems, live, even if possible.) And for the important data with "copies=2", assuming at least 1 copy of the data is good, I can recover it from bad bits / blocks on the other.

In reality, my "important data" is less than 4.7GBytes so I probably could have gotten away with single layer DVD M-Discs.