How can I monitor disk I/O speed?

Can you help me to add custom WMI monitors? Q: Can you help me to add a custom WMI monitor? For example, what query can be used to check disk C: Read & Write Bytes per Sec? A: The following custom WMI Query can be used:

SELECT DiskBytesPerSec FROM Win32_PerfFormattedData_PerfDisk_LogicalDisk WHERE Name = "C:"

In general, if you need to read a Windows performance counter value, you should

1. Find the corresponding Win32_PerfFormattedData-derived WMI class: http://msdn.microsoft.com/en-us/library/aa392397 http://msdn.microsoft.com/en-us/library/aa394253
2. Choose the needed class property (properties correspond to counters). For example, properties of Win32_PerfFormattedData_PerfDisk_LogicalDisk class can be found at: http://msdn.microsoft.com/en-us/library/aa394261
3. Construct the WMI Query as

       SELECT <property name> FROM  WHERE Name = <instance name>
   

   Note: WHERE clause is required if there are several instances (e.g. if several logical disks are configured)

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