I think we have to be realistic: a fast drive like this does make some noise and is not totally silent like a solid state drive. The WD scorpio did something I really didn't like which was that it sounded like a fan revving up and down. Besides that, it was very quiet. I can hear the hitachi too but the sound doesn't change, just a very faint sound from the actual spinning -- I don't hear any clicking or any other noises. All in all it's a very quiet drive, but I can't say that it's silent.
I suppose it's all subjective, but I am very sensitive to sounds.
I suppose it's all subjective, but I am very sensitive to sounds.