https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CCEQFjAA&url=http%3A%2F%2Fsupport.xbox.com%2Fen-GB%2Fxbox-360%2Fsystem%2Fdisc-drive-solution&ei=ExB_VICEM8OR7Aa31IGYDg&usg=AFQjCNG0ia275OigOuJv-cldv-MVyiXeGA&bvm=bv.80642063,d.ZGU
The link is to the microsoft website and should help you!
If this has helped, please dont forget to accept the answer and rate the answer.
Ryan