Originally Posted By: James C
Yes both Macs have FireWire. I will look into getting an external. What's the advantage of using patchburn?
It installs a driver for newer burners to make them work with with Finder burning in older versions of OS X. It usually works, but sometimes not, that's why I recommend getting the one with DragonBurn in case Finder burning doesn't work. Finder burning explained.

Here's the PatchBurn page. Click on the FAQ link on that page, it explains what it does.