Bad Superblock (Mount killed)
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Mount will sometimes fail with the somewhat cryptic error message -- killed. This can be an indication of a bad superblock.
Fortunately Linux stores backup copies at 8193, 32768, 98304, 163840, 229376 and 294912. ( 8193 in many cases only on older systems, 32768 is the most current position for the first backup ).
You can view this info by running $ dumpe2fs /dev/sdb1.
To fix run
e2fsck -b 32768 /dev/sdb1
if this doesn't work you can try 98304 and so on.
This can recover hard drives that are not accessible by other means.