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Hard Drive being used when System is Idle
http://www.vistaarticles.com/articles/447/1/Hard-Drive-being-used-when-System-is-Idle
By 
Published on 09/23/2007
 
Find out what is using your hard drive.

Hard Drive being used when System is Idle
1. Click Start
2. Type Reliability under Start Search
3. Click Reliability and Performance Monitor
4. Click Read or Write to find which application is using the Hard Drive.