WD  My Book Office Edition 500 GB USB 2.0 Desktop External Hard Disk Drive Box Content - My Book Pro Edition II Dual-drive Storage System, FireWire 800 cable, FireWire 400 cable, USB cable, Power adapter with cord, Quick Install Guide 1 TB (1000 GB) Capacity Interface - USB 2.0, FireWire 400 & 800 Spindle Speed - 7200-RPM Data Transfer Rate on USB 2.0 - Up to 480 Mb/sec