Western Digital 640GB 3.5 Hard Drive.
500GB capacity size.
Plug and play.
Compatible with Windows 2000, XP, Vista, Mac OS X 10.4.8 or later.
USB 2.0 compatibility only.
Size (H)16.6, (W)13.7, (D)5.4cm.
USB cable, AC adaptor and quick install guide included.
Turn on and off with your computer.