Welcome to the Apple Support Communities
If you bought the Apple USB SuperDrive, see this page to make it work with the Mac Pro > http://www.tuaw.com/2012/04/02/use-the-macbook-air-superdrive-with-any-almost-ma c/
You must do that because the Apple USB SuperDrive is set up to work only with Macs that didn't come with a SuperDrive, and the Mac Pro includes the SuperDrive
Been a few weeks since the reply but just in case people are still wondering, I used a similar site to find out how to make it work but with easier instructions.
I just purchased an Apple USB Superdrive tonite, performed the following task and it works just fine, reads data and works with Apple DVD Player, eject functions work properly.
My computer is a 2006 1st gen Mac Pro 2x3.0ghz quad-core intel xeon running Snow Leopard 10.6.8
Do the following:
Open Terminal and paste this:
sudo pico /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
Then press return
Then paste this:
<?xml version=”1.0″ encoding=”UTF-8″?>
<!DOCTYPE plist PUBLIC “-//Apple//DTD PLIST 1.0//EN” “http://www.apple.com/DTDs/PropertyList-1.0.dtd”>
Then press Control-X, press Y, press enter to save it.
Restart your computer
Hope this helps someone make the jump, my Mac Pro internal superdrive wouldnt open anymore but I was scared to do it.