I have this WD6400AAKS-00A7B2 hdd. I used to have it on an external case. Yesterday i switched it over to my chassis , and i realised that it makes this huge ciclic magnetic noise. When i disconnect it from the sata power cable the noise stops and as soon as i plug it in it starts. Then i tried to put it outside the case, just on top of my desk table and the ciclic magnetic noise just spreads over the desk…The hdd works fine…but this noise is just making me nuts…!