ST905004EXA101-RK Hard Drive is 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 operating system, so there is no software to install and nothing to configure. Saving files is easy too, just drag-and-drop. Its not just easy to use, but its 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.