In contrast to the (expensive) cable CU0047 same brand this cable from LogiLink is perfect. Both with and without power connection is flawless data transmission on the 2.5 "Seagate hard drive, the current demand is respect probably something critical I have tested with file transfers in the field of 10GB and more in detail, which always are otherwise extremely critical -. The data transfer is absolutely stable , How much of the current connection brings, I can not say, because the cable works perfectly well without it. But it is now definitely on the safe side in case of power hungry USB 3.0 peripherals. The cable I would have to buy it now, but Adversity is smart .... I am very satisfied and would recommend 100% ... if it holds out a long time, it is for this price a very favorable purchase the cable.