autocd thing?
I cant remember why right now but i think its to do with mode-types (data mode-1, mode-2 and audio mode etc). the fit over 700mb audio onto a 650mb* CD-R - keeping in mind it's also rated as 74minute, which at cd-quality isn't 650mb!
Im not quite sure what you mean by autocd... - but if your looking @ audio, change the nero indicators to Minutes instead of Mb... it helps un-confuze you
... and keep Minutes for audio and Mb for Data...