How to format usb drive on mac

Go to the Disk Utility app on your Mac using one of the following methods, depending on the type of disk or volume you want to erase:

• If you want to erase your startup disk: Start up your computer in macOS Recovery, then choose Disk Utility in the Recovery app.

  To learn how to start up your computer in macOS Recovery, see Intro to macOS Recovery.

  Note: If you want to get your Mac ready to trade in, sell, or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant.

• If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder.

Choose View > Show All Devices.

In the sidebar, select the storage device you want to erase, then click .

Click the Scheme pop-up menu, then choose GUID Partition Map.

If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase—it’s at the top of the hierarchy.

Click the Format pop-up menu, then

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