I just bought a new black Macbook and I was thinking about buying a portable external hard drive to complement it. I was reading that some USB-powered drives don't work with laptops...is this the case with Macbooks? Do any of you guys have portable external hard drives that are USB-powered and works on a Macbook? I was going to get a Western Digital Passport. This is my first Apple computer since the early 90s so I'm a total noob when it comes to Apple compatibility. Any suggestions/comments would be appreciated. Thanks!