Have you tried a new wire?
I dont have one that fits but that's why I tried the other HD on this pc and another one, as a control group.
I should also mention that I tried 2 different usb ports (disc on key) on both computers and both worked without a hitch.
I will buy a new cord once I am certian I have exhausted all options.
Someone told me something about uninstalling the usb hardware and then to plug it in and initiate a new installation but I'm not clear on the details...