Connect the USB drive to your Mac
Open Disk Utility
Select the USB drive from the sidebar
Click Erase
Enter a name for the drive
Choose a format
Choose a scheme
Click Erase
Wait for the process to finish
Click Done
Eject the USB drive safely
Connect the USB drive to your Mac
Open Disk Utility
Select the USB drive from the sidebar
Click Erase
Enter a name for the drive
Choose a format
Choose a scheme
Click Erase
Wait for the process to finish
Click Done
Eject the USB drive safely