I bought a WD 250gb passport drive. What the package didn't way was that it needed to use TWO usb ports to power the darn thing. I thought, "That's fine...no big deal." Until I remembered that I only had TWO usb ports on my Powerbook G4! If I buy a USB 2.0 hub, can I still get enough juice out of it to power the hard drive and still be able to plug other stuff in like my ipod?