Simple, quick answer to the Hard Drive temperature question. If you can take the heat in your car, then the empeg should be able to, at the very least when it is off, which it would be if your car was off, in a parking lot. I imagine you'll want to cool the interior of your vehicle down while you're inside it, unless you like sitting in 100 degree heat . Thusly you should be fine when you actually want to use it as well.