Debian here. I used Mint after ditching Ubuntu around 2010. For some reason, when I upgraded the drives in my internal RAID1 from 2TB to 14TB a fresh Mint only recognized 999GB... Ubuntu too (tried just out of curiosity). Grandma Debian recognized the full size so I installed and stayed. That was 2022ish. No complaints.

It is a old (2013?) mobo / firmware RAID, not a "true" RAID, and those are known to be a bit odd.