Seagate expansion portable drive add on storage for your pc the seagate expansion portable drive is compact and perfect for taking with you on the go add more storage space to your computer instantly and take large files with you when you travel set up is straightforward 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 also it is automatically recognised by the windowsreg operating syste