I have G4 867, 650 MB RAM, OSX 10.3.1. I bought Pioneer DVR-106 and wanted to start burning data DVDs. I am using Toast 6 for it. First two DVDs were burnt OK. After that I ran into problems (already spoilt 3 blank DVDs !). Short while after starting burning I get a report: Illegal request error etc. BUFFER UNDERRUN. Finished. I can throw out the DVD. I wonder why this happens. To choose "prevent buffer underrun" is active only till I insert a DVD, after that this option disappears. What to do ??? What is the problem ?