If your goal is to wipe the drive and start over without needing external media, Windows has a built-in reset tool.
This is the most common method for users planning to perform a "clean install" of Windows. how to format your c drive
Insert your Windows installation USB or DVD and restart your computer. If your goal is to wipe the drive
: Use backup software to create an exact clone of your drive in case you need to revert. how to format your c drive