dephtu@dephtop:~$ sudo mdadm -E /dev/sda1
mdadm: No md superblock detected on /dev/sda1.
dephtu@dephtop:~$ sudo mdadm -E /dev/sdb1
mdadm: No md superblock detected on /dev/sdb1.
dephtu@dephtop:~$ sudo mdadm -D /dev/md0
mdadm: /dev/md0 does not appear to be an md device