you can actually burn more than 700mb on a cd by overburning if your recorder supports it some media you can squeeze an extra 20mb on but depends on the recorder and the media., an app i seem to remember called burn to the brim i think was what most used. why burn to cdr at all,most copies of dvd movies on cdr are such crap quality that they border on being unwatchable, buy yourself a dvd recorder if you want to backup your movies the price of discs is falling rapidly and dvd blanks are not a vast amount more expensive than cdr.