Comment 83 for bug 441941

bean (bean123ch) wrote :

search is not needed if you know what the partition is (you can confirm it using ls in grub shell).
driemap is not needed unless windows is in a second disk.

Therefore, the mimimum commands required to boot windows is:

set root=(hd0,1)
chainloader +1

You can enter them in grub shell to see if it boots.