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WD My Passport 640GB External USB Portable Hard Drive
This hard drive's WD SmartWare visual backup control center automatically and continuously backs up data and provides a visual display as it backs up, making it easy to track and protect your important files.
640GB maximum storage capacity
For expanded storage for your files.
High-speed USB 2.0 interface
Measures just 4.3" long and weighs just 6.3 oz. for portability.
PC and Mac compatible
NTFS formatted for use with your existing PC (requires reformatting for use with Mac OS X Tiger, Leopard and Snow Leopard).
Internal or External: External
Drive Capacity: 640GB
Drive Connectivity: USB 2.0
System Requirements: Windows XP, Vista or 7 Mac OS X Tiger, Leopard or Snow Leopard