Join Date: Sep 2010
Location: Bury, lancashire
mine did this ,its laserburn .
the laser has got to close to the disc ,vibrations can cause it( i have wooden foors and the kids running round the room will doit ) the xbox not being level and moving it while its working also causes it or thr laser getting to hot (which is a relacement job)
covered under warranty if it is afault , register at xbox (just enter the serial number )
and theyl pick it up and fix it .
HMV have a disc cleaner and this can recover the disc, not all the time but at £2 its worth apop