...
- Ensure the Flash Drive is connected to your computer.
- Use spotlight (the magnifying glass in the upper right-hand corner) to search for Disk Utility and open it.
- The drive will be listed on the sidebar under External, select it and click Erase.
- You may set the new name of your Flash Drive partition, select ExFATand click Erase.
- When the process is complete click Done. You may now use your Flash Drive.
...