xfs_repair force_geometry

[Benedikt Schmidt]

Hi,
currently I'm looking for the correct usage of the force_geometry option 
of xfs_repair. I wasn't able to find more documentation on this option 
beside that it exists. Could please somebody explain it to me?

For a more detailed description of my problem: I've got here a hard disk 
which is dying at the moment, so I copied all the content with dd_rescue 
to a new and bigger one. To use xfs_copy wasn't possible as the 
filesystem was already corrupted. So now I've got nearly everything on 
the second hard disk (dd_rescue could'nt copy something around 6 or 7 
MB), but I can not mount the filesystem or even run xfs_repair on it, as 
it fails to find a superblock. I think the problem lies in the fact that 
the new disk has a different geometry than the previous one.

Kind regards,
Benedikt Schmidt