That will set it back to factory as un-initialized.
Select disk # (replacing # with the correct #) My recommendation, would be to use a Windows elevated command prompt (right click and run as admin) - beware this will wipe any data on the drive!!!! If you've used Rufus on the drive before, or another media creation tool, most of the time, wiping the drive and rebuilding it will correct any boot issues with ATI or other products again. Saad - tools like Rufus modify the partition layout of the USB flash drives.