Here is the setup. XP MCE 2-320gb hdd set up in raid 1 with the os on one partition along with apps the other partition has the videos and pics etc. If I want to upgrade the os to vista what will I need to do? Am I going to lose all the other things on my other partition? Someone said they would have done a raid 1 with the os on a whole other hdd but didn't say why? Is anyone knowledgeable enough to explain it to me and tell me what process I will have to go through? Thanks .