Gparted Information and Warning:<i>Filesystem volume name:   <none>Last mounted on:          /i-data/f128dac5Filesystem UUID:          c2f55399-a8ab-400b-a144-d605ceb58c9dFilesystem magic number:  0xEF53Filesystem revision #:    1 (dynamic)Filesystem features:      has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isizeFilesystem flags:         unsigned_directory_hash Default mount options:    (none)Filesystem state:         cleanErrors behavior:          ContinueFilesystem OS type:       LinuxInode count:              122068992Block count:              488249472Reserved block count:     0Free blocks:              480389347Free inodes:              122066932First block:              0Block size:               4096Fragment size:            4096Reserved GDT blocks:      907Blocks per group:         32768Fragments per group:      32768Inodes per group:         8192Inode blocks per group:   512Flex block group size:    16Filesystem created:       Fri May 25 16:45:58 2012Last mount time:          Wed Dec 31 17:14:27 2014Last write time:          Wed Dec 31 17:29:55 2014Mount count:              369Maximum mount count:      21Last checked:             Fri May 25 16:58:00 2012Check interval:           15552000 (6 months)Next check after:         Wed Nov 21 15:58:00 2012Lifetime writes:          2351 GBReserved blocks uid:      0 (user root)Reserved blocks gid:      0 (group root)First inode:              11Inode size:           256Required extra isize:     28Desired extra isize:      28Journal inode:            8Default directory hash:   half_md4Directory Hash Seed:      bc641083-df73-4c0a-8560-ac502897cba0Journal backup:           inode blocks</i><i>dumpe2fs 1.42.12 (29-Aug-2014)dumpe2fs: A block group is missing an inode table while reading journal inode</i><i>Unable to read the contents of this file system!Because of this some operations may be unavailable.The cause might be a missing software package.The following list of software packages is required for ext4 file system support:  e2fsprogs v1.41+.</i>e2fsprogs is installed and its version is 1.42. It's on Debian 8.3.
How to mount HDD extracted from singledrive-ZyXEL NAS
mount;nas
First, create some directory for the mountpoint, e.g:mkdir -m 755 ~/zyxelnasIf you don't have mdadm installed, you need to install it now:sudo apt-get install mdadmSupposing the drive is sdb, 2nd partition, as in my case, we assemble the one-drive array; note that if you already have some arrays configured, please change md0 to a suitable value:sudo mdadm --assemble --force /dev/md0 /dev/sdb2If it succeeds, supposing it is your ony array md0, mount it as follows:sudo mount /dev/md0 ~/zyxelnas