ubuntu@ubuntu:~$ sudo debugfs -R features /dev/sdd1
debugfs 1.42.5 (29-Jul-2012)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize

ubuntu@ubuntu:~$ sudo tune2fs -o journal_data_writeback /dev/sdd1
tune2fs 1.42.5 (29-Jul-2012)
 
ubuntu@ubuntu:~$ sudo tune2fs -O ^has_journal /dev/sdd1
tune2fs 1.42.5 (29-Jul-2012)

ubuntu@ubuntu:~$ sudo e2fsck -f /dev/sdd1
e2fsck 1.42.5 (29-Jul-2012)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
wrt: 148608/60989440 files (2.1% non-contiguous), 59551151/243928064 blocks
ubuntu@ubuntu:~$ 


ubuntu@ubuntu:~$ sudo debugfs -R features /dev/sdd1
debugfs 1.42.5 (29-Jul-2012)
Filesystem features: ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize