like note that slow computer could be due to other reasons.

If drives are not full it means actually you are not utilizing the 100% space.

It could be a temporary software issue and can be solved easily.

100% disk usage issue

Are you looking for the answers, that why is it happening?

What are the cause of this issue?

What is responsible for the 100% disk utilization?

End task to free up disk utilization

Actually, there is not any specific reason for this issue.

Below can be culprits.

So you have to follow some step by step procedure to get rid of this problem.

start stop windows search and prefetch services

How to fix 100% disk usage issue?

kindly peek if Windows 10 is not downloading any update or not running any windows update process.

If it so then let the Windows finish first and it will solve the issue automatically.

Disable disk Fragmentation in Windows 10

May be it will finish the process and get back to normal state.

If disk usage not go down then make a run at terminate the running processes or applications.

you’re able to do this from the task manager.

Switch Power Plan

It will bring down the disk usage.

Then start these services again.

Note:We do not recommend to stop these services permanently to fix this issue.

But disabling there is no harm in disabling them temporarily.

Disable disk defragmentation

Sometimes disk defrag can also cause the 100% disk usage error.

Specially when you are using a SSD and in task scheduler a defrag task is in schedule.

So shut down the Disk defragmentation task by turning it off.

Below steps will help you to do this.

As per the feedback by the Microsoft community, it mostly happened due to the conflict between two software.

Mostly it was because of the Chrome and Skype apps.

Also Read:SSD vs HDD

Hopefully above steps will fix the issue quickly for temporary issue.

But if you are facing this issue more often then below steps are also worth to try.

Some times this could also be due to the unfinished Windows updates.

So if this is so then let the Windows finish the updates first.

Windows update will also fix some other issues which are the cause of the 100% disk usage issue.

So check manually that your windows is up to date.

If problem still persists then move to the next steps.

Switch to high performance power plan

6.

Run system file checker command

Sometimes a corrupted system file can also be the cause of this issue.

Chances are less but it is worth to give it a try.

fire off the SFC command by running DISM command first.

This command will also fix some other errors of operating system.

Read :How to run DISM Command.

Now your next step should be toReset Windows.