I need help backing-up Halo

[theoriginalmre]

My friend tried, and found it was over 6Gb or something, so couldn't be fitted onto a 4.7Gb dvd-r.

What do i need to do to fit it on? (I have the PAL version.)

PS: On a side note, what's the diff between the PAL and NTSC versions? On the game size list on these boards, it shows them to be different sizes.