your only on a 400 mhz machine, correct? buffer underrun simply means that the computer couldnt feed the drive data fast enough, so the burn failed. happened to me ALL the time on my old beige G3 266 (had a 52x cd burner, the ATA drive simply couldnt throughput enough data, so i was forced to burn at 16x max rates (and not do any multi-tasking while burning) even my current home machine, a G4 867, buffer underruns at 52x burning if i am doing too much extraneous work (unless i am burning from a secondary drive). this was the whole reason that toast 4 locked down os 9 when it was burning-the failure isnt software, rather hardware. now, my G5 at work, i can encode a DVD, burn DVDs at 4x and have itunes and Photoshop going all at the same time and have zero lag. oh, and i have never had buffer underrun protection (burn-proof, et al) work correctly except on a PC, on the mac side it never seems to do any good. sandor ----------------------------------- On May 10, 2004, at 7:58 PM, Kevin Willis wrote: >> I am also using the Pioneer 106D, revision 1.05, together with Toast >> 6.03. I haven't had any problems with burning DVD, and I mostly use >> DVD+R, works like a charm in 4x. >> (G4 500 MHz here) >> >> Best of luck!! >> >> / Vicki >> > Mine is rev 1.08. Is there a firmware update that might help? > > Thanks > > Kevin