this review is for the SanDisk MobileMate USB 3.0 microSD Card Reader - SDDR-B531-GN6NN
plugged into usb port with microsd inserted. couldn't get device to recognize card. i moved around to other USB ports, other PCs. finally it was read. i think it takes a minute or so to get recognized. kind of strange really. but once recognized it works fine. i need to play around with it more to really figure out what is going on with it.