My Passport Essential WDBACY3200ABK 320 GB 2.5" External Hard Drive - Retail Box Contents - Portable hard drive, WD SmartWare software, USB cable, Quick Install GuideFeatures Dual USB 3.0 and USB 2.0 interface - A single drive with universal compatibility today and next-generation speed for tomorrow. Use it with USB 2.0 now and step up to USB 3.0 speed when you're ready. Up to 3x faster transfer rates - When connected to a USB 3.0 port this drive lets you access and save files up to 3 times faster than USB 2.0. Transfer a 2-hour HD movie in just 5 minutes instead of 13 minutes. WD SmartWare software - You're in control of your backup. Install all the features, select just the components you need, or if you prefer, choose not to use the software at all. Automatic, continuous backup - Works quietly in the background to protect your data using minimal PC resources. Whenever you add or change a file it's instantly backed up.