I have two MacBooks, both of them have single platter (160GB/250GB) Hitachi Travelstar drives inside, and you can' t hear anything but total silence. I bought a Samsung Spinpoint M8 750GB and Hitachi Travelstar 750GB (same model as the stock). The problem is that neither is as quiet as the original disks. The Samsung write/read noise is pretty annoying. Why is that? How can an old 160GB HDD from 2009 be quieter than both Samsung and Hitachi new models. Is there anything I might have done wrong?