Which USB port for extra power for external Superdrive?

I just bought an external USB slimline optical drive that doesn't use AC power, instead it comes with a USB Y-connector so that it can use two USB ports for power.  I can't really spare the extra port.  I read that the Mac mini 2011 is compatible with the Apple USB Superdrive.  It does this by supplying additional power over USB, like the MacBook Air.  I've tried my drive with just a single port and it powers on and can do some stuff, but suddenly it'll crap out and the OS will tell me the disk was removed without being ejected.  I've determined it's a power issue.  Does anyone know which port in particular the extra power is delivered through?  I'd test myself, but I'm afraid I may be damaging the optical drive when it craps out.
Thanks

I'd get a good AC high powered USB Hub...
http://eshop.macsales.com/item/NewerTech/USB2HB7PRO/
http://eshop.macsales.com/item/MacAlly/TRIHUB4/
USB thing reproduce like Rabbits!

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