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*** e2fsck
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
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
or
e2fsck -b 32768 <device>
test.img contains a xfs file system labelled 'test_filsys'
*** debugfs
debugfs: Bad magic number in super-block while trying to open test.img
test.img contains a xfs file system labelled 'test_filsys'
*** tune2fs
../misc/tune2fs: Bad magic number in super-block while trying to open test.img
test.img contains a xfs file system labelled 'test_filsys'
*** mke2fs
Creating filesystem with 16384 1k blocks and 4096 inodes
Superblock backups stored on blocks:
8193
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