Just my own experience here, not quantified at all. I just replaced the original 20GB with a Seagate 'cuda V 80GB, and I haven't noticed any noise at all. I may just be experiencing bounce back from having been hearing the shrieking of the fan on that BTO Radeon, which I recently Green Slimed into silence, but really, I haven't noticed anything. Granted this is a V and not a IV. JB On Thursday, April 24, 2003, at 08:04 AM, Lithium wrote: > I have two Barracuda IV drives, 40GB and 80GB. > > 40GB one is really quiet but 80GB one is not. I know 40GB one has one > platter and 80GB one has two. Two platters make the difference so much > or my 80GB one is defective?