Clarification on Disk Utilization (WMI)

Clarification on Disk Utilization (WMI)

Hi there, 

I am new to OpManager. I just added a node to OpManager, wihich is polled using Windows Credentials (WMI). 
In the first Summary Tab, I see the a chart for Availability, Packet Loss, Response Time, CPU Utilization, Memory Utilization, Disk Utilization (WMI)

All others are fine and I understand that. But, what does the Disk utilization (WMI) Means?

Below is a snap shot of the Summary and also the snap from Disk Management Console on the Server.



Thank you very much in advance.



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