The card reader works, unfortunately, very bad. The card reader drives login indiscriminately on Windows (7) again. This also happens when cards are inserted into the drive. If time data transfer is possible to start this until very neat (> 40MB / s at a 45MB / s SDHC Card), then breaks but after about 5 seconds to less than 5MB / s, probably because the card reader access not in principle work properly. Was tested with several cards (SD & SDHC): Always with the same result. The card reader has been tested at several USB3 ports; only with the org. Recently cord and also with USB3 certified extensions. Stable operation can not reach you. Other USB3 devices (such as hard drives) can be operated without any problems at the überigens same USB3 ports of the computer.