I read several thing that a DVD-109 should work with Mac OSX 10.4 so I used the expert mode in Patchburn and removed the patch. Did the about and got: PIONEER DVD-RW DVR-109: Firmware Revision: 1.55 Interconnect: ATAPI Burn Support: Yes (Unsupported) Profile Path: None Cache: 2000 KB Reads DVD: Yes CD-Write: -R, -RW DVD-Write: -R, -RW, +R, +RW, +R DL Burn Underrun Protection CD: Yes Burn Underrun Protection DVD: Yes Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO Media: No Looks like I need to run Patchburn again! ------------------------------- Just ran Patchburn and did a restart. It now says: PIONEER DVD-RW DVR-109: Firmware Revision: 1.55 Interconnect: ATAPI Burn Support: Yes (Vendor Supported) Profile Path: /Library/DiscRecording/DeviceProfiles/PatchBurn-pioneerdvdrwdvr109.drprofile Cache: 2000 KB Reads DVD: Yes CD-Write: -R, -RW DVD-Write: -R, -RW, +R, +RW, +R DL Burn Underrun Protection CD: Yes Burn Underrun Protection DVD: Yes Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO Media: No