I have the same here , I connect my SATA HDD, on usb box to my pc, but as Intru3r55 say's, i have power supply with that box, when i need to use i turn it on,then shut it down... As long as the box on the HDD will be spins..
And about USB support even if you login to windows step you cannt change it ,the only way is to get power supply, to cut off the electirc circle.. i have try al the ways to find even some program do that outo log off,but no chance at all.
BTW..I can help also with these things, any program guys you want will be here..for anything even for hack..lol