WMI HDD performance

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I need to monitor how much data is being written on my hard drive each day. I came across the ;Win32_PerfFormattedData_PerfDisk_PhysicalDisk Class, and tried using it, but it returns different values, among them 0.
My questions are:

- Why do these values keep changing?
- I got two instances from this class and I do not know the meaning of the attribute Name, which has different values in each instance: the first one is C: D: and the second value is _Total. Which instance should I use to get the performance of the hard drive ?

Posted 1-Apr-14 0:55am

ala deli

Updated 1-Apr-14 6:22am

Rage

v3

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[no name] 1-Apr-14 9:13am

This question doesn't make sense. This won't tell you how much data was written per day.
"returns different values among them 0 values" - which values are you talking about?

Rage 1-Apr-14 12:18pm

Here the link to the class description:
http://msdn.microsoft.com/en-us/library/aa394262%28v=vs.85%29.aspx

Can you post your code ?

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Maciej Los · Answer 1 · 2014-04-01T11:31:00

OK, if you want to know how many data were written on the hard drive each day, i think you need to change your logic. You need to check the hdd capacity and free space on the beginning of day, then free space at the end of day. It would return the growth (increment) of the data saved on HDD.

For further information, please see:
WMI Tasks: Disks and File Systems[^]
WMI Tasks: Performance Monitoring[^]
WMI C++ Application Examples[^]