How to Format a USB Flash Drive Using Disk Utility on a Mac How to format a USB flash drive using Disk Utility on a Mac # How to format a USB flash drive using Disk Utility on a Mac Launch Finder From the Applications tab, select Utilities Launch Disk Utility Select the USB flash drive and click Erase Create a Name for the USB flash drive Select File system formatTip: Select 'ExFAT' File system format and select 'GUID Partition Map' for the scheme Click Erase Click Done after USB flash drive is erased successfully and safely eject it!