Lynn: >I'm looking to upgrade an old G4 400 sawtooth to 10.2 and a DVD writer. > Due to an old scanner I have to be able to still operate this machine >in OS9. > >Both the Pioneer 105 and 106 DVD writers are compatible with this model >- but does anyone know if I have to upgrade firmware also? I'm >concerned that the firmware upgrade will prevent me from using OS9. 2 years ago I installed a Pioneer 105 in my G4/450 sawtooth. It has worked fine in both OS 9.2.x and OS X 10.2 -> 10.3.5. It is still at firmware v1.00. I have never upgraded the firmware, since I'm a believer in the "if it ain't broke, don't fix it" philosophy. Can't speak for the 106. Check the XLR8 database: http://forums.xlr8yourmac.com/drivedb/search.drivedb.lasso