1 e2fsck external journal 2 ../e2fsck/e2fsck: Filesystem has unsupported feature(s) while trying to open test.img 3 4 The superblock could not be read or does not describe a valid ext2/ext3/ext4 5 filesystem. If the device is valid and it really contains an ext2/ext3/ext4 6 filesystem (and not swap or ufs or something else), then the superblock 7 is corrupt, and you might try running e2fsck with an alternate superblock: 8 e2fsck -b 8193 <device> 9 or 10 e2fsck -b 32768 <device> 11 12 Exit status is 8 13 dumpe2fs external journal 14 Filesystem volume name: <none> 15 Last mounted on: <not available> 16 Filesystem magic number: 0xEF53 17 Filesystem revision #: 1 (dynamic) 18 Filesystem features: journal_dev metadata_csum 19 Default mount options: user_xattr acl block_validity 20 Filesystem state: clean 21 Errors behavior: Continue 22 Filesystem OS type: Linux 23 Inode count: 0 24 Block count: 2048 25 Reserved block count: 0 26 Free blocks: 0 27 Free inodes: 0 28 First block: 1 29 Block size: 1024 30 Fragment size: 1024 31 Blocks per group: 8192 32 Fragments per group: 8192 33 Inodes per group: 0 34 Inode blocks per group: 0 35 Mount count: 0 36 Check interval: 0 (<none>) 37 Reserved blocks uid: 0 38 Reserved blocks gid: 0 39 First inode: 11 40 Inode size: 256 41 Required extra isize: 28 42 Desired extra isize: 28 43 Default directory hash: half_md4 44 Checksum type: crc32c 45 Journal checksum type: crc32c 46 Journal checksum: 0x661e816f 47 Journal features: journal_64bit journal_checksum_v3 48 Journal block size: 1024 49 Journal length: 2048 50 Journal first block: 3 51 Journal sequence: 0x00000003 52 Journal start: 0 53 Journal number of users: 1 54 Journal users: 117f752e-f27d-4f6f-a652-072586a29b82 55
