Grub2 mapping drives

[mrrangerman43]

Well after a lot more searching I finely found the answer.

If the windows bootloader is on a entirely different harddrive than grub, it may be neccessary to trick windows into believing that it is in fact the first harddrive. This was passible in the old grub with map, and is now done with drivemap. Assume grub is on hd0 and windows on hd2, you need to add the following after set root

drivemap -s hd0 hd2

So after editing my /etc/grub.d/09_Windows script it looks like this

#!/bin/sh -e
echo "Adding Windows XP to GRUB 2 menu"
cat << EOF
menuentry "Windows xp" {
set root=(hd1,1)
drivemap -s hd0 hd1
chainloader +1
}
EOF

make sure after editing the script you run update-grub this will write the changes to grub.cfg located in /boot/grub/

I should also note for anyone reading this later, Grub2 numbers partitions starting with 1 and NOT 0 as Legacy Grub used to. So instead of root (hd0,0) Grub2 would look like so

set root=(hd0,1)

So I'm not sure who does it but this thread can be marked <SOLVED>
thanks