I still play games on my PS2 and just got some new ones. I noticed after playing the same disc for a while (lets say 30 hours) it begins to form this rainbow ripple pattern (kind of patchwork-looking, faint just like the ps2 logo on the 4 spots on the disk), so I thought it might just be my PS2. I checked the read side of an old game I used to always play on my other PS2 (because that one has a network adapter) and sure enough, it has them too! But the games read perfectly. I also checked some "used" games that I haven't played yet, 2 of them have it. Is there any technical explanation for this phenomenon?
edit: I got a picture that shows it
edit: I got a picture that shows it

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