I have a G4 450 with the DVD-ROM running OS 9.0.4. The DVD software is version 2.2 and software update says I do not need to update any software. Apple DVD player cannot open certain DVD's because "The disk may be dirty or scratched, or the disk manufacturer encoded the disk incorrectly". I cleaned the disks, but the error still shows up so I am assuming that DVD OS 9 doesn't have support for this type of encoding. Is there any way to find or install these drivers or are these DVD's windows only? Is there any way around this?