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Recently my hard disk corrupted and my HDD reported as being 100% in use all the time. This slowed my computer to a crawl and became totally unusable at times. I fixed it by changing it with an SSD. However:
I noticed the Task Manager looked something like this. Notice disk usage is at 100% even when applications are using 0.1Mbps. Not my image

However, I've noticed while reading and writing anything that speeds easily cross 100Mbps but the usage stays at 70-80%.
So my question what value is this a % of?

a3y3
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The percentage refers to the disk activity time (disk read and write time). You can get this info clicking on the Disk in the Task Manager Performance tab.

https://www.windowscentral.com/how-use-windows-10-task-manager-monitor-system-performance

spike_66
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