Okay so I understand the theory behind what all this bios mod is but can someone please explain Everything that I need and the steps from start to finish to modify my HP pavilion dv6 3259wm BIOS. It is Insyde H20 version f.23 11/11/2010. Thanks everyone. oh yeah and what Iam trying to do is be able to change sata controller settings in bios to add an xp os to my partition on hard drive that boots up in IDE mode...Is this even possible??