HD My Book Premium 320GB SATA 7200rpm 3 Gb/s External Storage
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)
Intelligent drive management features - The My Book external drive turns itself on and off with your computer and Safe Shutdown™ prevents the drive from being powered down until all your data has been written. (Works with the USB connection only.)
Smart design - The elegant case, iconic of a book, takes up less space on your desk, stacks horizontally, and allows two or more drives to nestle neatly together like volumes on a shelf.
Fast, high-quality hard drive - Inside the case is WD’s exceptionally fast, ultra-quiet, cool-running SATA 3 Gb/s hard drive with a 16 MB cache.
Free Google™ software - Search your drive, manage your photos, and simplify Web searches with included Google software. (Windows only).
Western Digital HD My Book Premium 320GB eSATA 7200rpm . Hard drive capacity: 320 GB, Hard drive speed: 7200 RPM. Color of product: Black. Width: 2.23" (56.7 mm), Depth: 5.63" (143 mm), Height: 6.78" (172.2 mm). Data transfer rate: 3 Gbit/s, Data transfer rate (max): 480 Mbit/s, Maximum capacity: 320,059 MB