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To format a flash drive on a Mac, plug in the drive and open the "Applications" folder, the "Utilities" folder and then "Disk Utility." Your flash drive should be listed in the left menu. Select the drive, and then click "Erase." When you see the volume format types listed, choose "MS-DOS (FAT)." Some older flash drives may only have the options "FAT 16" or "FAT 32." Choose the highest number available if "MS-DOS (FAT)" doesn't appear.