Usually stores like Game Crazy and the Radio Shack Repair Center offer to buffer discs, but buffering is for scratches in discs, I'm not sure if it can fix a crack.
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It's probably your ps3's bluray player. You have to send it to sony to get it fixed. If it only happens on a particular game then you probably need to wait for an update on that game.
Have you tried placing in a new hard drive? If not, try it. If it doesn't work, take it to a place where they fix PS3's or to the store where you bought the PS3 and see what they say.
yes
No it is a PC game and not a PS3 game
Start my making sure it is charged and connected to the PS3 by using the cable that comes with the PS3