I noticed my games like God of War 2 have like dust rings all over the discs from where I guess the game is read. It's definitely dust since it wipes off but like I don't get how they make perfect circles or how the dust got there in only a few days. I just cleaned the system not to long ago. Is the Slim models dust magnets? I don't remember my fatty ever getting games that dusty or even dust really building up in it. Explain please.