mount ext4dev drive?

[raspjuan]

hi,

I am trying to mount a ext4 file system via terminal. however, terminal give me error messages: mount: unknown filesystem type 'ext4dev'

lsblk -f /dev/sdb1

NAME FSTYPE LABEL
sdb1 ext4dev shared

I don't understand why FSTYPE is ext4dev. this drive used to connect to my pogoplug as a shared drive within family network. pogoplug produce the same error when mounting the drive. mount: unknown filesystem type 'ext4dev' after rebooting.

I think hard drive is working fine because it has never had any issues in the past and its running without any noise. please tell me how to mount this drive. Thanks

cat /proc/filesystems
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

[epoch1970]

It appears ext4dev is an ancient development version of ext4 (circa 2008)
Not sure what can be done. Taking a full backup (at fs level or with dd) looks like a good start...

[raspjuan]

thanks epoch1970

May you tell me how to do a full backup at fs level? how do use dd to do it? right now, I can not even mount the drive.

thanks

[pcmanbob]

If you really must have the data off the drive and cant afford to loose it, I would clone the drive using clonezilla on a PC using the bootable cd version
http://clonezilla.org/clonezilla-live.php

then work with the cloned drive so if you mess it up you can always clone the master drive again.

edit..

Seeing as raspbian is Debian based my be the is will help.

https://wiki.debian.org/Ext4