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To do so, plug it into one of your Mac's USB ports, which resemble thin, rectangular slots on your computer's housing. Some Macs don't have USB ports, so you'll need to purchase an adapter. It's a menu item in the top-left side of the menu bar. If you don't see Go, first click the Finder icon, which resembles a blue face in your Mac's dock. This option is in the Go drop-down menu. You'll likely find this option in the middle of the Utilities page. It's on the far-left side of the Disk Utility window. This option is at the top of the Disk Utility window. It's in the middle of the page. This will bring up a drop-down menu with the following options:  Mac OS Extended (Journaled) Mac OS Extended (Journaled, Encrypted) Mac OS Extended (Case-sensitive, Journaled) Mac OS Extended (Case-sensitive, Journaled, Encrypted) MS-DOS (FAT) ExFAT You'll generally use one of the Mac OS options for a Mac-only flash drive (e.g., a backup drive), though you'd choose MS-DOS (FAT) or ExFat for greater compatibility. This will begin the formatting process. Once the formatting is complete, you'll see an icon for your flash drive appear on your Mac's desktop.
Connect the USB flash drive to your computer. Click Go. Click Utilities. Double-click Disk Utility. Click your flash drive's name. Click the Erase tab. Click the "Format" box. Click a format option. Click Erase, then click Erase when prompted.