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It's not the first time she's done it, so I always save my games to my hard drive but I only had so much hard drive left that I installed the multiplayer disk and not the campaign + plus my xbox is on the floor so she can literally come around the wall and pick it up in like 2 seconds which brings me back to my other question, anyone know how much GB's of hard drive the campaign disk takes?

I was playing the campain disk and my sister picked up my xbox, now it has somewhat of a circular disk scratch, but it works perfectly, except forerunner ( which I just tried for the first time ) won't work. It goes to the mission load screen then takes me back home. Is this caused by the disk? If so how can I fix it? And if I were to borrow a friends disk and install it, does anyone know how many gbs the campaign disk is?