ala_2 0 Newbie Poster

I need to monitor disk, to know how much data is being written on my disk per day. I came across "Win32_PerfFormattedData_PerfDisk_PhysicalDisk" Class.But the problem is that returns different values among them 0 values.My questions are

-why these values keep changing?

-i got 2 instances from this Class and i need to know the meaning of the attribute Name witch have two values the first one "0 C: D:" and the second value is "_Total", so witch instance should i use to get the performance of the hard drive?

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