Someone just gave me an old G3 Power Mac that works fine but has OS9 installed. I'd like to put Tiger on it but it has a CD-ROM drive instead of DVD. Looking at the currect drive it seems like a standard CD tray drive. Is it possible to swap out this drive with a DVD drive or do I have to have a special type of drive approved by Apple? I'm doing this so that my kids will have a access to another computer in my office.