Not portable, purchased drive failed on me, Seagate replaced it, no problems since
Sandro Campos Mancini, Amazon
6 February 2015
Summary: Could be smaller, does not work without AC power. Not portable at all. Only for desktop systems, consoles, media devices. I bought it as an external storage device for a WD TV Live I have at home, and it works perfectly, although it takes a while for the device to index it when turned on (don't know...