your usage doesn't make any sense,
Yes, disk is at 100% but that app is showing as using .1mb and yet its sorted in usage?
Win 10 1809 did have a problem showing correct usage of processes, but I am fairly sure that is fixed now. Do you have latest windows updates?
Have you got latest drivers for motherboard as sometimes lots of disk usage can be caused by old drivers
Download
Process explorer and run it as admin (it comes from Microsoft so its safe) - its just a more powerful version of Task manager, shows WAY more info than you need.
the default view is tree structure meaning like your task manager screen, it will show what processes are under each service, but unlike task manager, it shows the usage of each part so you can see what is eating your hdd but we will need to add a few columns first.
when you run it, right click on the header line that shows Process and click Select Columns
choose the Process Disk tab
as for which columns to add, I would try a few of them (Not sure what Delta Reads are?)
once you choose, click OK and the columns will be added to far right of the window, I would drag them to the left so you can see it all.
Needs to be run as admin to see hidden system processes.