Hard Drive Noise

I didn't know where to stick this but i have everything in my case (in sig) very quiet excpet for 1 thing.. MY HD!, it's just making it's normal noise but it's all i can here and it's ticking me off because if i boot my system without it hooked up it's like near dead silent but with the hard drive pluged in it makes a constant noise (i guess just from the spinning) i dont here it clanking around reading or anything just the ambient noise of it being on.. any suggestions?

What you can try to do it mount your hard drive on some rubber grommets to kill some vibrational noise from harddrives. That antec case you have the hard drives vibrate the hole case.
This is how hard drives are hooked up on a Antec Sonata case pretty cool.

you might want to have a look at cmcquistion's excellent guide here for quietening hard drives:

http://www.overclockers.com/tips1108/