Hello, I am contemplating buying this drive http://www.bhphotovideo.com/c/produ...ital_WDMS3200TN_320GB_My_Passport_Studio.html (at a much lower price from another seller) to use on my Macbook Pro 2.2 SR. I have an Apple 4-pin to 6-pin FW 400 cable and was wondering if this would power the hard drive? The FW400 cable that it comes with has a USB2.0 and FW400 split, which is leaving me to believe that it may need to draw power from the USB bus. Does anyone know if it will draw this solely from one FW 400 cable? Thanks for the information!