Make sure you are choosing the Mode 2/XA.. this is what enables the overburn window when burning data..
Overburning works just fine if you follow these instructions..
Set Nero to overburn 90 or 99 min.. how ever big your media will hole.. .ignore that Nero only sees 703 meg!
set : "ISO Level 1" is ticked and "Mode 2 / XA" is ticked too and also "ISO 9660" and "Joliet" and you can also tick (if you want) "Allow pathdepth of more than 8 directories" and "Allow more than 255 characters in path"
Burn : "Write" and "Finalize CD" are ticked and write speed is up to you and "write method" should be set on "Disc-At-Once"
Note... Mode 1 has an 80 min limit!.. My Car kenwood Mp3 player will play 99 min audio .cdr's just fine..even when converted from Mp3's by nero.....
But Note again!.... nero sets the settings when you burn audio and doesn't even give you a choice to burn "Mode 2 / XA" which is needed to burn data.
This is why my player plays audio just fine but will not play correctly the data mp3's, because my player wants mode 1.