I read it twice I hope I understand what it is you want to do. You are going to format both OS partition's on the one drive. So you don't need partition magic to do this. Just boot from the xp cd and partition it in there, (delete all partitions first) Just select how big you want it and format and install it to that partition, After that's done just boot to the w2k cd and format and install it on the remaining space..Done! Now the only problem I can see you having is with the second hdd, Here's how I see it. Format that it in computer management from a windows environment and format it NTFS (you could just leave it as it is as well) and as long as you keep normal (no bitmap images and such) files and folders. you won't even notice a difference when going from one OS to the Other.