I know it is not my CD drive. I know it is not my fan. I know for certain that it is my hard drive that is rev high periodically. I ran virus scan (Norton) etc, but found nothing. I suspect it is the virus that is trying to run the system to the ruin. Help.
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?