77 MB / s transfer rate (via a USB 3.0 hub) on a 4GB file to a disc 3 "5 The 2 ..." 5 does not need power. Great, it works, and well (I'm wary of hazards on branded USB 3.0 products). By cons ... ... Mr Inateck z'auriez not able to stick a power supply with a standard connector ??? !!!! For those who do not understand ..... I, for my external hard drives, two kinds of power: that of my old Fujitsu and those of all my other external hard drives (which are all the same) .. . Well, I have a third, now ... (balot, right?) ...