I want to connect my Panasonic VDR to my PC via its USB port and cable. When I plug them in a notice on the VDR screen says to connect the AC adapter which I understand but cannot do until I get the appropriate cable -----but I also get a notice which says "CHANGE MODE TO USB". I cannot find anything in the user Manual about this. There is no mention of USB MODE or how to change to it. I have clicked on every option which has been displayed. Can someone advise please?