I did the flash on my TiBook SuperDrive to D101 which gives me DVD-RW support. (Woohoo!) However, a number of us (but not all of us) who have done this can't use quick erasing in Toast. It seems to quick erase fine, but then the disc is unusable in both Toast and iDVD, until it is fully erased. Once fully erased it works fine again. I'm using Pioneer DVD-RW here.
Do you 17" owners have the same problem?