If there's sound here, I'm certainly not hearing it. Not that I can't hear the hard drive sound; I don't hear any sound at this link, nor is the volume button present as is normally the case when there is sound.
In any case, there's not much you can do about a sound if the sound is internal; hard drives are not user serviceable. Assuming this isn't something that can't be solved by tightening it to a hard drive cage or a small wedge, the options are to either ignore it, stop using it, or try to RMA it.
If it's the sound of a failing drive -- drives can fail at any time -- the only thing you can really do is double-check that the backups that you should always be maintaining are properly intact.