Seagate Expansion 640 GB USB 2.0 Portable External Hard Drive ST906404EXA101-RK

640GB External Portable Drive...Seagate external portable drives are compact and perfect for on-the-go. Instantly add more storage space to your computer and take large files with you when you travel. Setup is straight forward, simply connect a single USB cable and you are ready to go. The drive is powered from the USB cable, so there is no need for an external power supply. Plus, it is automatically recognized by Windows, so there is no software to install and nothing to configure. Saving files is easy too, just drag-and-drop. It's not just easy to use, but it's fast and energy efficient too. Enjoy fast data transfer speed with USB 2.0 connectivity and 5400 RPM drive performance. Built-in power management ensures energy efficient operation.