Western Digital My Book Premium ES Edition 320 GB 320GB external hard drive

My Book Premium ES Edition External Storage Solutions 320 GB, Dual Interface With both the popular USB 2.0 and the ultra-fast eSATA 3 Gb/s interfaces on board, the My Book Premium ES Edition external hard drive offers universal connectivity and unbeatable performance in one high-value package. Works with both Windows and Macintosh computers. Includes EMC Retrospect Express backup software.

Product Features
Easy to set up, easy to use - Installation is a snap because you don't really "install" this drive, you just plug it in and it's ready to use. There is no CD to install; the included software loads from the drive the first time you plug it in.

Dual interface - USB 2.0 -- For convenience and compatibility among multiple computers, USB 2.0 is the way to go.
eSATA 3 Gb/s -- The ultra-fast eSATA interface gives you speed comparable to a state-of-the-art internal hard drive. This is the future of external storage made available today.

PC and Mac compatible - Works with both Windows 2000/XP and Mac® OS X 10.3 or later

EMC Retrospect Express backup software - Includes Easy-to-use EMC Retrospect Express backup software for Windows and Mac.

Capacity gauge - See at a glance how much space is available on your storage system. (Works with the USB connection only)