So.... should it be making that noise?

Okay, so I am having a bit of paranoia with my 360 right now. The thing is that I am asking for a new Ps3 for my bday, so if my xbox breaks, I am pretty much sol. It's been making a slight clicking noise consistently while I play Battlefield: Bad Company 2. Just wondering if that is normal. It's not like insane or anything, just this sort of slight clicking noise while I play. Just so we have all the facts, I did buy it used, and it is a little damaged, so it might just be having trouble reading the disc. Is it normal?

My xbox makes more noise then a baby crying it aint normal. ( i dont know anybetter since i already have it 1 year )
But when i play at a xbox elite or ps3 its just a miracle how quiet they are.
Dont know about ur situation, but it can be that ur disk has a hard time reading the CD's and that it takes alot of effort to keep em running.