it fell by accident . it was vertically mounted , and had CoD4 in it . when i turned it off, i accidentally made it fall and then when i opened the disk tray , the CoD4 disk has a ring on it ... like a dent, i will take a picture later . the size of the ring is the same size as those mini disks . when i put the disk in, it makes a clicking noise and while playing the game, i get the disk error . hopefully, there is no problem with the DVD Drive, and if there is, ugh ... i don't want to buy another xbox . i tried putting Halo Reach in, no noise . so i am guessing there is some problem with CoD4 and the disk drive ?