Hard disk keeps running in the background

Hi, I have a computer here that has its hdd running in the background. I don't know what its doing. How do I findout and prevent this?
sorushAsked:
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Dave BaldwinFixer of ProblemsCommented:
The most common reason is that Windows is indexing your files for faster access.
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BeghemotCommented:
Hit CTL+ALT+DEL, go into task manager and look at the processes

Find the one that is using the CPU cycles and see if it sheds any light on the situation.
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the_scotsman_Commented:
If you have Windows 7 or Vista, you can use Resource Monitor to show exactly which processes are using the hard drive.

Just go to start menu and in the box type Resource Monitor. Double click the "Disk" bar to expand it and it lists all processes that are using the hard drive.
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mottakuttyCommented:
Probably a virus scan might be running if not checking the perfmon for read/ writes will shed light on the activity whether the disk is reading or writing data. This would make diagnosis easier
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lekshmikpCommented:
Maybe the disk is being indexed, could be your anti-virus utility scanning
in the background. Have you checked the Task Manager to see which processes
have highest memory usage and CPU cycles? Could help filter down the
problem. I would also run a scan using the AV or the built in Windows
Defender antispyware utility.
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