How to hide btrfs devices in nautilus?
Solution 1:
I got rid of that entry by adding a fstab entry with a /mnt mountpoint, that would be:
/dev/sdc1 /mnt/nonexistent btrfs noauto 0 0
/dev/sdb1 /mnt/nonexistent btrfs noauto 0 0
for you.
(With some help from Stackoverflow )