Upon startup, waking from sleep, and loading the "storage" tab in About My Mac, my laptop makes a noise as if it's whirring away underneath the trackpad for a few seconds. If this makes any sense it sounds like: vrr, vrr vrr vrr vrr, vrr vrr vrr vrr, vrr vrr vrr vrr, vrr. One short noise, three longer whirring/scratchy/vibrating kind of noise (can't think of the right word to describe) then another short noise and it stops. I have a 5,1 MacBook Late '08 release with 4GB RAM and 500GB HDD..... Someone must know the problem and how to fix?!?!