If you can determine that the noise you are hearing is coming from your hard drive, you have 1 of 3 problems and all are bad. 1 something is out of sync on platter read and writes. 2 you have some damaged sectors on the pysical hard drive or 3 the drive is actually making contact on the head with the platters which is really bad. Any of the 3 mean you need a new drive some sooner than later.