Prepare to Format | Save My Gig

Step 3c

Prepare the USB

This is survivable only if you made the safety copy in the backup step.

The next step ERASES this USB completely. Anything that failed to copy earlier is gone for good. If any of those files matter, stop here and take the fresh-drive route instead.

Are you ready to erase this USB and continue?

You follow these steps at your own risk. Formatting or erasing a drive can permanently destroy data. Full disclaimer.