Game backup size question (newbie type)

[Beleidat]

Hi guys

I am totally new to XB's and have a quick question of the newbie type, on game sizes.

I am waiting for my XB to come back from the guy installing my mod but want to know what types of sizes games are (yes I have seen the sticky) and how you go about burning the large ones to DVD if a DVD-r only hold 4.37GB

I am planning to do the following when the XBOX gets back:
1. FlashFXP files from cdrom to my PC's hard Drive
2. Use Craxion4 to create the xISO
3. Use Alchohol 120% to burn the xISO

sounds simple enough I think but the sizes are what worry me

any input would be greatly appreciated