So I went to the store and asked for a replacement, but to test the disk they used a ps3 slim.. Mine is a super slim and very conveniently there was no noise in the slim .
But I argued and finally got a replacement.
Gotta check of the sound still exists.
the Super slim ps3 has that issue of vibrations while reading discs.
google about it.
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IIRC, there are some simple fixes also.