Unable to mount ext4 file system, it says mount: unknown filesystem type 'ext4dev'?

I am trying to mount an ext4 file system in Ubuntu terminal, but I get the error message

mount: unknown filesystem type ext4dev

$ lsblk -f /dev/sdb1
NAME FSTYPE LABEL
sdb1 ext4dev ext4

The hard drive is working fine.

I don't understand why FSTYPE is ext4dev. it should be ext4, right?

The following is result from cat /proc/filesystems. What should I do to make my system read ext4dev hard drive. thanks

nodev sysfs
nodev rootfs
nodev ramfs
nodev bdev
nodev proc
nodev cpuset
nodev cgroup
nodev cgroup2
nodev tmpfs
nodev devtmpfs
nodev configfs
nodev debugfs
nodev tracefs
nodev sockfs
nodev pipefs
nodev rpc_pipefs
nodev devpts ext3 ext2 ext4 vfat msdos
nodev nfs
nodev nfs4
nodev autofs f2fs
nodev mqueue fuseblk
nodev fuse
nodev fusectl

1 Answer

Yes, it should be ext4, not ext4dev. See the types of filesystems your system supports via cat /proc/filesystems.