1 ext2fs_open2: The ext2 superblock is corrupt
2 ../e2fsck/e2fsck: Superblock invalid, trying backup blocks...
3 ../e2fsck/e2fsck: The ext2 superblock is corrupt while trying to open test.img
5 The superblock could not be read or does not describe a valid ext2/ext3/ext4
6 filesystem. If the device is valid and it really contains an ext2/ext3/ext4
7 filesystem (and not swap or ufs or something else), then the superblock
8 is corrupt, and you might try running e2fsck with an alternate superblock:
9 e2fsck -b 8193 <device>
11 e2fsck -b 32768 <device>