ubuntu@ubuntu:~$ sudo fsck -f /dev/sdc5
fsck from util-linux 2.20.1
e2fsck 1.42.9 (4-Feb-2014)
ext2fs_check_desc: Corrupt group descriptor: bad block for block bitmap
fsck.ext4: Group descriptors look bad... trying backup blocks...
Pass 1: Checking inodes, blocks, and sizes
Deleted inode 2885537 has zero dtime.  Fix<y>?