The Seagate STAA500100 FreeAgent GoFlex 500GB Ultra-Portable Drive ultra-portable drive makes it easy to store, automatically and continuous backup and encrypt all your files with its preloaded software and plug-and-play USB 2.0 connectivity. But this is no ordinary external drive. As the core of the GoFlex Storage System, the Seagate STAA500100 FreeAgent GoFlex 500GB Ultra-Portable Drive is the world’s most upgradeable external drive allowing it to deliver a truly customizable experience. The Seagate STAA500100 FreeAgent GoFlex 500GB Ultra-Portable Drive is the heart of the GoFlex Storage System, and by combining it with other GoFlex Storage System products you can enjoy your content on your TV, access files from any PC or Mac computer on your network, from a mobile device or via the internet while on-the-go.