As of right now..you can't. This has been discussed extensively over in the MacNN forums here. It seems that the drive is capable of 2x DVD-R speeds, 16x CD-R write, 8x CD-RW, etc. It also seems to be a DVD-multi drive, so it should be able to burn DVD-RW and DVD-RAM as well. However, it seems that Apple modified the firmware to limit the capabilities. Someone is working on a firmware fix here.