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Spammer - ignore the idi0t...
1. How do you know its your hard drive - really?
Is this a desktop or laptop? Laptops will slow down the hard drive to save power. There is usually a setting in the bios to optimize for power or for performance. Performance just sets the drive to its speed all the time.
Desktop - typically the hard rives run at their posted rpm no matter what.
Many systems will spend a fair amount of time indexing your files for better search speed - you may hear your drive working to do that - but it should go away after awhile.
While I will opine that Norton is crap, you could try running malwarebytes to search for a virus. If that passes then it is just the sound your system is making.
I suppose it could be the drive beginning to go bad?