# Pastebin YqYN7PGp ```root@rescue:~# mkfs.ext4 -L nixos /dev/sda1 mke2fs 1.42.12 (29-Aug-2014) /dev/sda1 contains a linux_raid_member file system Proceed anyway? (y,n) y /dev/sda1 is apparently in use by the system; will not make a filesystem here! root@rescue:~#```