In this very thin housing (approx. 11mm) the hard disc is very accurately fixed & does not need to be extra screwed. The brushed aluminium surface lets this housing appear very elegant & your data is surely protected. Easy installation without screws. The blue (USB 3.0) or green LED (USB 2.0) lamp immediately shows the interface, with which you are currently working. The USB (Universal Serial Bus) 3.0-interface offers an approx. 10x faster data transmission than USB (Universal Serial Bus) 2.0.