This cable simply does not: a USB port 3 keys or external hard drives connected to it are disconnected or are not even recognized (while with my old USB extension 2 no problem, except of course that the flow is less). On a USB 2 port that seems to operate normally, but it does good to me since I bought this cable to my USB port 3 located behind the computer. And there I see the limits of online business because if I had bought in the store I would have reported.