dumpe2fs: MMP: invalid magic number while trying to open test.img Exit status is 2 Superblock has invalid MMP magic. Fix? yes 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 test_filesys: 11/128 files (0.0% non-contiguous), 19/512 blocks Exit status is 0 dumpe2fs: it is safe to mount 'test.img', MMP is clean Exit status is 0 MMP_block: mmp_magic: 0x4d4d50 mmp_check_interval: 5 mmp_sequence: 0xff4d4d50 mmp_update_date: test date mmp_update_time: test_time mmp_node_name: test_node mmp_device_name: test.img mmp_block_number: 8