loud hard drive noise!

WD 150GB 10,000 RPM raptor

Hey guys 90% of the time when opeing a game like CSS ,battlefield 2142 and splinter cell or any game my harddrive makes loud normal(I think) annoying reading sounds,but after a while I realized I get it alot of times when opening IE or firefox when opening up programs.It's very loud and annoying ,but I know the actual sound it's making is normal.What can I do to stop it from making noise? is my harddrive defected? I defragged it and checked for hd errors and there are no virus on my computer.Even when I am doing nothing the hard drive keeps making wierd reading noises no beeps though.

 

Have you been to WD site and DL and run a Diagnostic programme which will pinpoint any irregularities/bad sectors. You will need to get inside com to read exact HD reference numbers.