Hello there. why don't you use another DVD Burning Software?
Burn as "Data CD/DVD" and you will use the 4.7GB, if you burn them as Video CD/DVD you will use the 120mins.
I'd suggest you use the free solution :: RocketDivision :: CD/DVD/Blu-Ray/HD-DVD recording and mastering
Download the portable if you want so you don't install anything in your PC. i've been using StarBurn for 2 years now, and it has been awesome.
Take a look, download and happy burning
Post your results after finishing