I recently purchased my transformer pad infinity without the optional dock. I noticed the dock has its own full sized USB port, so i figured you could connect certain accessories too it, such as flash drive, mouse, controller, phone etc. I went ahead and purchased the asus 30 pin usb adapter that plugs into the same spot the charger does. I tried to plug in my android phone into my android tablet through a usb cord, and the pad seems to recognize it for a second but i cant access the files on the phone to transfer files. Does anyone know the limitations of the usb port? What it is capable of? Does the dock do something the usb adapter wont? Am i just doing something wrong? Any information would help, Thank you.