If your USB is bigger than 64GB, Windows File Explorer may not be able to execute the formatting.
After this, you'll need to re-create a new bootable drive with Windows ISO files.
Please follow STEPS carefully.All to install Boot Camp on Mac - STEP BY STEP PROCEDURE.
To resolve, complete these steps: Make sure that you're using an external USB flash drive with a storage capacity of 16GB or more. The most common reason for that is that there is not enough space, or Boot Camp Assistant assumes … Occasionally, when trying to create a bootable Windows USB drive, you might run into the error ‘your bootable USB disk cannot be created.’.
