How to get rid of multiple partitions on a usb flash drive

  1. hit windows-x and hit ‘command prompt (admin)’
  2. type ‘diskpart’
  3. type ‘list disk’
  4. type ‘select disk #’, with # being your flash drive
  5. type ‘clean’
  6. type ‘create partition primary’
  7. type ‘format fs=fat32 quick’
  8. type ‘active’
  9. type ‘assign’
  10. then finally type ‘exit’

Found here –