I flew this morning raid 1 of two hard drives. Debian, respectively, everything in read-only remounted. I tried to copy the data from the array through FTP, scoring, because it does not work in read-only (the bug of the old version, it was necessary to upgrade for a long time).
I pulled out 1 hard, slipped it into the test bench, FS = RAW, 100% of 100% were used. Mount rw ext4 fails.
Slipped hard back into the car:
MBR error 1
I do not know much in this life, send somewhere. The data is important.