adding cdr drive to g4 powermac

wow, I thought that would be an easy question.
I have tried a sony and mad dog combodrive but both came saying "does not support".
Would that be drivers? Software?
Any ideas?
You can try a program called "Patchburn" (available at that adds support for certain unsupported drives.

Or, you can get yourself a Pioneer DVR-106 through a Pioneer DVR-109 and it should be natively supported in Tiger without the need for drivers or patches. Those drives can be had for under $100.