Do you mean that the **installer** cannot see the drive? Or--do you have SUSE running and you cannot see the drive from Linux.
If XP runs from that drive, then it is obviously healthy and any Linux installer should see it---and even offer to re-format it for you...
From within SUSE, you would first need to mount the drive.
Tell us more about overall configuration: total # and size of drives, what is installed and working and what has only been attempted.