This may sound like an odd thing to want to do, but there is a reason. I have a new 250GB HDD. I want to put it in a PC, create a 100GB NTFS partition and install XP. Then, I want to take the HDD out of the PC, connect it to my MBP using a USB adaptor and create an HFS+ volume in the remaining 150GB. Is it possible to do this and will OS X re-write the MBR/Partition Table such that the disk will still function as a Windows boot disk? When formatting it initially would I be better to leave the 150GB as free space, or create a partition but not format it? Alternatively, I could use Win7-RC rather than XP as, I believe, Win7 can use GPT. Would this be a better choice as GPT is the system used by OS X?