Just thought i'd put this here, just incase anyone else gets it.
Last night after the clan war, my ps3 froze. Restarted and get an error, cannot start disk. Then the disk disappeared from the XMB. Rang sony and its basically corrupt data. I tried deleting the MW2 update patch and single player profiles, but this didnt help.
Sony said it could be corrupt data anywhere not just for mw2. So, Last night i Restored my ps3. you loose everything. Not much on mine so wasnt to bothered.
Restore takes 4 hours, so left it running and went online this morning. And all is well. Id say even better than before.
My ping is better and connection is running faster.
Subject: PS3 Cannot start disk Error