Есть два HDD которые раньше были объединены в raid0 через mdadm:
mdadm --create /dev/md0 --level=raid0 --raid-devices=2 /dev/sd[b,c]1
# dmesg | grep md
[ 1.501468] md: Waiting for all devices to be available before autodetect
[ 1.501526] md: If you don't use raid, use raid=noautodetect
[ 1.501685] md: Autodetecting RAID arrays.
[ 1.532178] md: invalid raid superblock magic on sdb1
[ 1.532237] md: sdb1 does not have a valid v0.90 superblock, not importing!
[ 1.550071] md: invalid raid superblock magic on sdc1
[ 1.550129] md: sdc1 does not have a valid v0.90 superblock, not importing!
[ 1.550191] md: Scanned 2 and added 0 devices.
[ 1.550247] md: autorun ...
[ 1.550301] md: ... autorun DONE.