ya boy coppin

Hey guysim new here but..ive latley had this problemfrom either my halo or my 360.when ever im in matchmaking almost every other match it says disc unreadable.now i just got my xbox back from sending it off an i have a brand new halo..ive been looking this up for a while an some people said it couldd be the hard drive or or the halo disk or the console can someone please help...