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Q: 

IOWriteBytesPersec is actually total bytes?

The documentation for the Windows WMI counter 

    Win32_PerfRawData_PerfProc_Process.IOWriteBytesPersec

says it's number of bytes per second, but it behaves like a total. For example, the same data is viewable in task manager as "I/O Write Bytes" but the value only ever seems to go up, never down. The same goes for read bytes. Is it actually a running total?

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