I purchased a 120GB hard drive, and used the transfer cable it came with to put my 20GB files onto the 120GB HD. Now, Xplorer360 works very well, and the USB device responds immediately when plugged in. I can hear and feel the HD turning. When I put the 20GB in, nothing happens, and it is unrecognized. I've tried restarting, tried unplugging it, tried formatting it, tried Xport360, tried everything. Why won't it work with 20GB hard drives? Remember, it is a used transfer cable. Is there files on the 20GB that I have to remove somehow?