Windows 10 disable automatic defragmentation

In addition to the method geotavros described, another method for turning off automatic defrag/optimization can be accomplished by doing the following....

1. Click on the Start Menu
2. Start typing Defrag and you'll see an option come up called Defragment and Optimize Drives. Select that.
3. Make sure the drive you want to turn off defrag/optimize is highlighted and then click on Change Settings.
4. Uncheck the box that says Run on a schedule
5. Click on OK and you're done.

Alternative process with Command Prompt::

• Run Command Prompt as administrator and run the command schtasks /Delete /TN "\Microsoft\Windows\Defrag\ScheduledDefrag" /F

• /TN option specifies the path\name of the task to delete.

• /F option forcefully deletes the task and suppresses warnings if the specified task is currently running.