Seagate Expansion portable drive, add-on storage for your PC. The Seagate Expansion portable 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 simple and straightforward; simply connect a single USB cable and you are ready to go, powered from the USB cable. Take advantage of the fast data transfer speeds with the USB 3.1 Gen 1 port, backwards compatible with USB 2.0 for additional system compatibility.