If the disc is WAY more than 700MB, then you won't be able to get away with it. However, if it's about 720 or something slightly over it, then here's what you can try:
Go to File, then Options. Click on the Expert Options tab, and then check "Enable generation of short lead-out". That should enable you to squeeze an extra 12MB onto the disc. Also, enable overburning on the same tab. It may or may not work, depending upon your burner.
One last thing to try, and is something highly recommended by the scene, is Alcohol 120%. Download the trial version from their website and burn away (30 day fully-working trial).
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