Have usually 2 hard drives per PC installed. The A to work, the other to back up data. If the PC on the desk stands are the hard drives sounds especially bothersome. 2 hard Patten have mostly various Resonazfrequenzen which aufschaukeln.Dann is only one thing: housing and the hard disk for data backup put out of service. However, Samsung recently bought F1 does not require this measure. Is so good!