What is causing low physical disk % idle time

Recently I observed that all my four hard disks installed in my XP Pro machine show a % idle time physical disk counter between 50-60% all the time, even when the PC is fully idle. I checked the processes running in the background and I can't find nothing
causing this constant disk activity.
When I run XP in safe mode the counter is normal (average 99,60%). I also observed that in normal mode, when I connect a USB stick, the counter is normal (99,5%). After disconnecting the stick drops again to 50-60%.
How can I find what is causing this disk activity?

If you are getting your information from the Windows Task Manager, that is not disk activity shown. That is CPU activity.
So, where are you getting your information?
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. ”
Dear Rick Dee, do you have any idea about my issue about % idle time (physical disk counter on perfmon)?

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Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
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