Ok I have been on the hunt for the quietest hard disk to use in my PC which I also use as my HTPC. At the moment I have a quiet Q-Tech PSU, my CPU and both my graphics cards are watercooled using the Zalman Reserator. So the hunt was on for a quiet Hard disk. I have IBM, Maxtor, Western Digital, Seagate Barracuda IV and a new Samsung Spinpoint (which I just bought, as a lot of places have reviewed this and said it is the quietest HD). You can strike Maxtor, IBM and Western Digital straight off your list. The real test is between the Samsung and Seagate. And my view? For me the Seagate is quieter. There are more vibrations but these can be dampened. It seems a little noiser, but the noise level is low pitch. The Samsung on the other hand has more of a high pitch noise which I find more noticeable. However all these noises were heard when I have the HD out of the case about 2cm from my ear. Once in the case they are very very quiet, almost inaudible a part from some occassions when the HD is being accessed sparodically. The Seagate I have been running in my G4 Apply cube, which is silent and it has been sitting on my bookshelf working away and I do not notice it at all. I will run the Samsung in my main PC and will continue to monitor it to see how it performs sound wise. But so far the Seagate is my preferred choice .. in addition I know that all my Seagate HDs have been very reliable, however I do not know how reliable a Samsung is having never had one previously. I hope this has helped someone! I am happy to hear your experiences and views as well.