AFAIK, all HP dvd- writers are +R/RW types and will not work on a Mac as Apple does not support (yet) the +R format. I attached a Ricoh +R/RW drive External FW drive to my G4 and it was recognized by Toast. I burned a dvd with it but it would not play properly on my standalone dvd player. I would suggest that you look for a -R/RW drive to use with your Mac. Hope this helps.
2008 iMac 24" 2.4 GHZ Core 2 Duo, 4 GB RAM, 3 External FW400 HDs, 1 External FW800 HDD, 2 External USB 2TB Drives, Epson R280 Photo Printer, OSX 10.5, External Firewire Pioneer DVD-R 112 and Benq 1620.
You know you're (getting) old when a woman says that you remind her of her father - Anonymous