I know that there are lots of threads on this topic or something similar to this topic, but lots of them are old and circumstances have changed. As stated in the title, I have a late 2007 Macbook Pro 15" with Intel Dual-core 2.2GHz processor, 3GB RAM, 120GB [internal] HDD (5400 rpm), and an 800 (along with 400) firewire port. I am running 10.5.6 (currently the most up-to-date version of leopard). So in order for me to play lots of games that exist (mainly Steam/Valve games) I need to run windows programs, and to be able to run at nearest native speeds it made most sense to use bootcamp and install XP on my internal. The problem is that I need a good amount of space for windows and the games. Right now the windows partition is about 40 or 41GB, which is currently JUST enough for everything (I have like 2.5GB left). I would like to make it a little bigger, but a change that would make a difference would reduce my mac partition to having only like 5 or 10GB left, something I would rather not have. Now comes my real question. I am currently in the process of getting the WD My Passport Studio 500GB (http://store.westerndigital.com/sto...goryID.13094300/parid.13092300/catid.13093000). This is mac-ready and has USB 2.0, Firewire 400, Firewire 800 capability. I know that my mac cannot boot from an external USB drive, but the drive I am getting has Firewire. I have been doing some research and it seems that the drive I am getting comes formatted as HFS+. If I am correct, this is the same way that the boot partition for mac is formatter (right?), so my mac should be able to boot off of the drive I'm getting. But will XP even install on the drive? I have tried installing it on an external USB (not formatted as HFS+) and it came up with an error about not being able to. So will it install on a drive that is formatted as HFS+? It would be great to get insight quickly into the matter. Thanks.