Well, i think i will send my second unit back too. Basically because of the crack. I can live with the bad clearance. But only in case that something happens in future, it will be better to have one without a crack. I'm afraid they could tell me that i broke it. And to get rid of the noise, i have to get a new HDD or SSD. Does someone know a good HDD that is less noisy and doesn't has so much vibration?