I have a desktop with two hard drives in it. I'd like to use it for audio recording, so it must be exceptionally quiet. At the present time the loudest components in my computer are the already quiet hard drives. In order to contain this sound I plan to surround my hard drives, with some around absorbing material, on as many sides as possible. Perhaps I will even encase the hard drives in a home brewed muffler. To prevent overheating I will also have to include a path for either air flow across the drives or heat conduction. Does anyone have any good suggestions as to what material I should use? Where can I get this material? I'd like to spend under $20 dollars, but I might consider going up to $200 or even $350 if the material is significantly superior. Actually $500 is not totally out of the question for true silence. On the other hand $6 do equally well. Sorry, if I have not posted this question in the proper forum.