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ext2fs_open2: Bad magic number in super-block

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root@partedmagic:~# fsck /dev/sda6
fsck from util-linux 2.23.2
e2fsck 1.42.8 (20-Jun-2013)
ext2fs_open2: Bad magic number in super-block
/sbin/e2fsck: Superblock invalid, trying backup blocks...
/sbin/e2fsck: Bad magic number in super-block while trying to open /dev/sda6

The superblock could not be read or does not describe a correct ext2
filesystem. If the device is valid and it really contains an ext2
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

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root@partedmagic:~# mke2fs -n /dev/sda6
mke2fs 1.42.8 (20-Jun-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
15851520 inodes, 63392256 blocks
3169612 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
1935 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872