ext2fs_open2: Bad magic number in super-block
../e2fsck/e2fsck: Superblock invalid, trying backup blocks...
../e2fsck/e2fsck: Bad magic number in super-block while trying to open test.img
+../e2fsck/e2fsck: Trying to load superblock despite errors...
+ext2fs_open2: Bad magic number in super-block
+../e2fsck/e2fsck: Superblock invalid, trying backup blocks...
+../e2fsck/e2fsck: Bad magic number in super-block while trying to open test.img
The superblock could not be read or does not describe a valid ext2/ext3/ext4
filesystem. If the device is valid and it really contains an ext2/ext3/ext4