If the Task Manager on your PC is showing that your disk usage is at 100%

If the Task Manager on your PC is showing that your disk usage is at 100%, it means that your computer is currently experiencing a high level of disk activity and all available disk bandwidth is being utilized. This can cause your computer to run slowly or become unresponsive. There are a few things you can try to fix this issue:

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Close unnecessary programs and windows: If you have multiple programs running at the same time, close the ones that you are not currently using. This will free up some of the disk bandwidth and reduce the amount of disk activity.

Restart your computer: Sometimes, simply restarting your computer can help fix the problem. This will close all running programs and clear out any memory that was being used by those programs.

Run a virus scan: Sometimes, a virus or malware can cause high disk usage. Run a full scan of your computer using your antivirus software to check for any malicious programs that might be causing the problem.

Check for disk errors: Run a disk check to check for any errors on your hard drive. You can do this by going to the Command Prompt and running the command "chkdsk /f /r".

Check for software issues: Sometimes, a program or service that is running on your computer can cause high disk usage. To find the program or service that is causing the problem, open the Task Manager, go to the "Details" tab, and sort the processes by "Disk". Then, check which process is causing the high disk usage.

Check for a background program which might be causing the usage: programs like Dropbox, Google Drive, OneDrive etc may use a lot of disk space when syncing or updating.

Check for hardware issues: In some cases, high disk usage may be caused by a hardware problem, such as a failing hard drive. Check your computer's SMART data to see if it is reporting any issues with the hard drive. If all the above steps fail, consider updating/changing your hard drive with a higher capacity and performance one. It is worth noting that some of these solutions may be more difficult to implement than others. However, by following the steps above, you should be able to find the cause of the high disk usage and fix the problem.