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