I have a MacBook Pro and my wife has a Dell laptop, if I were to purchase the LaCie 301442U d2 Quadra Hard Disk 1TB eSATA/FireWire800/FireWire400/USB 2.0 External Hard Drive would I be able to use it as a backup machine for both computers at the same time? Can it be partitioned to work with both OS X and Windows XP? I am trying to avoid having to purchase two external hard drives. Thanks in advance.