bash-3.1# fsck /dev/hda2
fsck 1.38 (30-Jun-2005)
e2fsck 1.38 (30-Jun-2005)
/sbin/e2fsck: Filesystem revision too high while trying to open /dev/hda2
The filesystem revision is apparently too high for this version of e2fsck.
(Or the filesystem superblock is corrupt)
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 <device>