need help to recover data from damaged hdd

[Alexander Appel]

=========================Original message text=========================
While booted in knoppix or 'linux rescue' upon booting the fc1 disk1 cd 
try using these options in your mount command:
-o ro,errors=continue

Hopefully you will then be able to read most of your files, depending on 
what was in the bad sectors.
=======================End of original message text====================

I tried to mount the hdd with the options above but got only another 
error message:
"wrong filesystem, illegal options, superblock of /dev/hdb1 is damaged 
or too many filesystems mounted"
(I'm not sure if I've translated the error messages allright - using a 
German system)
I'm pretty sure it is not the "wrong filesystem" because I used -t ext2 
and there aren't too many filesystems mounted. The whole command I'm 
trying to use is:
"mount -t ext2 -o ro,errors=continue /dev/hdb1 ~/mnt/tmp"