I think I can categorically say "no". There is a FAQ entry as to why here.

The big killer with my old style MP3 player which was based heavily on Hugo's original MP3 player was the startup current of the 3.5" drives on the +12V supply. I needed something like 1.5A at +12V but only for a short time. This was on top of the +5V required for the electronics. It also required a step-up/step-down supply to be able to handle the fact that a car's supply can sometimes be down near +12V. Laptop drives generally only need about +5v at 500mA.

So basically what the FAQ said.