While creating a dualboot VM (to test dual booting operating systems before doing it on a real machine), I looked at the Task Manager. This was the disk usage shown in the Overview tab.
This was the Performance tab, a few seconds later.
I can't think of any reason this would be, except that it is combining the disk usage for hard disk C: and USB drive E: (But this would not be the problem, as it sometimes shows the Overview disk usage at 100% with both drives plugged in (and Disk E: inactive), too).
Is this a Task Manager glitch, or something else I have not thought of?
Best Answer
That main window combines the disk usage of the two as you said.
I't doesn't seem to care whether or not the other drive is being used and it will always base the percentage depending on how many drives you have. in my case i have 3 drives and thus the main window will judge each drive on a scale of 33% each. if only one drive is handling operations in that moment then 33% will be the max usage reported for that drive, if two then 66% etc.
this is the epitome of stupidity by Microsoft as common sense would have indicated a person uses the task manager for a more in depth analysis of what's going on with their system, combining the usage of our drives isn't the smartest move. also there is no option to select if you want it to show usage per disk or not