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How does disk usage really work?

Haswellx86
By Haswellx86
in Windows
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Go to solution Solved by Eigenvektor,

https://learn.microsoft.com/en-us/previous-versions/windows/desktop/xperf/disk-utilization

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The Usage Percentage is computed by calculating the amount of time a disk is servicing I/O requests vs. the time spent idling.

 

An installer will likely copy a ton of small files, which would result in a lot of individual requests. While copying a large file is likely far fewer requests followed by a straightforward moving of data.

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I've always wondered how does the disk usage monitoring really work? Like when I am doing I/O of hundreds of MB/s or something, it might not be that high usage but when say an installer is doing only a few MB/s of I/O, the usage can go to a 100%. How does it work?

PLEASE MARK COMMENTS AS SOLUTION IF SATISFIED!!

bigger number better, makes me look cooler.

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  • Solution

https://learn.microsoft.com/en-us/previous-versions/windows/desktop/xperf/disk-utilization

Quote

The Usage Percentage is computed by calculating the amount of time a disk is servicing I/O requests vs. the time spent idling.

 

An installer will likely copy a ton of small files, which would result in a lot of individual requests. While copying a large file is likely far fewer requests followed by a straightforward moving of data.

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