Combo Drive CDRW/DVD-ROM PowerBook G4 (400&500&550 &667&800, 867Mhz,1GHz)(p/n 661-2690) CD-RW/DVD-ROM 24X/8X/8X/8X ... CDRW/DVD-ROM 24X/8X/8X/8X For Powerbook G4
If you are upgrading from DVDRom to a Combo Drive you need a upgrade kit , part#kit/PBG4Co Learn More