It has been several years since I have encountered such a problem, but it used to happen to me often....
I never did figure out the exact nature of the failure, but for data your drive is probably not going to work again.....
Try swapping your data cable.... if you are lucky you just have a broken conductor....
But more than likely a bad component ... just get a new drive if swapping cables doesn't work. A new drive is cheap enough to make messing with it any further a waste of time and energy.
Yeah, that's what I thought. thanks.