I paid an visit to the genius bar @ apple store pasadena today to get my mb air Hard drive check because it was making a loud clicking noise. The genius that helped me mad: wasn't helpful at all) name Lawrence asked me what's the problem. So i told him that my mb air is making random loud clicking noise. He replies that all hard drive have clicking sound, there's nothing wrong with it. Then i told him its a random issue, but the click sound is really loud, you can heard it even with music on. He then replies" So what you want me to do!?" I was shocked. I never experience this kinda attitude in apple store. I then told him that "i donno whether the loud click sound is normal or not so i'm came here to get a check." The genius again shocked me with this reply"theres not much i can do since its random, so you want to replace? get it repair or what?"