How to rescue my data files before reconfiguring the 2 HD's of my desktop PC?!

[NoOp]

On 04/09/2010 07:31 AM, Bas Roufs wrote:
...
> But each following attempt to normally restart the PC already
> stagnates in the very beginning as follows:
> GRUB Loading stage 1.5
> GRUB loading, please wait .....
> Error 18
> Already after 'Error 18',  nothing happens any more. Every restart
> attempt ends up in again 'Error 18', unless I boot from USB or CD.
> Apparently something has happened with the grub, because of which I do
> not manage any more to boot from the sdb7-partition. Also attempts to
> mount sdb7 via a live system have failed so far.
...

Personally I'd reinstall grub:

https://help.ubuntu.com/community/GrubHowto
 Backup, Repairing and Reinstalling GRUB
  Command line
Follow that & I think you'll be ok. If not, then I'd recommend that you
burn a supergrub cd (as you're still using grub1) and use that to
autofix your grub.