MSDN Library

PERF_RAW_FRACTION

Description This counter type shows the ratio of a subset to its set as a percentage. For example, it compares the number of bytes in use on a disk to the total number of bytes on the disk. Counters of this type display the current percentage only, not an average over time.
Generic type Instantaneous, Percentage
Formula (N0 / D0), where D represents a measured attribute and N represents one component of that attribute.
Average SUM (N / D) /x
Example Paging File\% Usage Peak

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