Any sounds other than a light humming or hearing that arm move lightly back and forth is usually a sign of the hard drive failure beginning.
Does the computer have a S.M.A.R.T.S. system on it in the bios. What model of computer is it? You need to get in the bios by tapping F10 or DEL key a few times when it shows the first screen on the monitor.
Once you get in bios, go through each tab and see if you can locate a smarts option and make sure it is enabled.
Scandisk is only good if there is actually bad sectors or bad headers on the platters of a hard drive, corrupt data and such, thus it gives you the software physical side of the hard drive, but the smarts is a self monitoring system. It detects abnormality in the hard drive itself and warns you ahead of time of a catastrophic failure due to the way the drive is not acting correctly.
Here is more info about smarts. Hope this helps.
What Is Drive eHow
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