root@debian:/home/supervisor# e2fsck -f -y -D /dev/sde2
e2fsck 1.42.12 (29-Aug-2014)
300GB_ext4: recovering journal
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 3A: Optimizing directories
Pass 4: Checking reference counts
Pass 5: Checking group summary information
300GB_ext4: ***** FILE SYSTEM WAS MODIFIED *****
300GB_ext4: 11/19537920 files (0.0% non-contiguous), 1275064/78143744 blocks
root@debian:/home/supervisor# mount -o remount,rw /media/supervisor/300GB_ext4
mount: cannot remount /dev/sde2 read-write, is write-protected