Whether you're working with a Mac or a PC, the Seagate FreeAgent GoFlex ($100-$200) is the ideal hard drive for your setup. This unique storage system is compatible with any computer, thanks to it's innovative design that splits the hard drive from the cable adapter and the circuit board. The GoFlex is available with USB 2.0, USB 3.0, eSATA or Firewire 800 connectivity and a number of styles and capacities from an ultra portable 320GB to a 2TB desktop version.