tubby:~# dumpe2fs -h /dev/sdn
dumpe2fs 1.41.12 (17-May-2010)
dumpe2fs: Bad magic number in super-block while trying to open /dev/sdn
Couldn't find valid filesystem superblock.
tubby:~# dumpe2fs -h /dev/sdm
dumpe2fs 1.41.12 (17-May-2010)
dumpe2fs: Filesystem revision too high while trying to open /dev/sdm
Couldn't find valid filesystem superblock.