- Connect the USB storage device to the computer.
- Open Preferences, Disk Utility.
- Click to select the USB storage device in the left panel.
- Click to change to the Erase tab.
- In the Volume Format: selection box, click
MS-DOS File System.
- Click Erase.
WARNING: Erasing the USB device will delete all content on the device.
- At the confirmation dialog, click the Erase.
- Close the Disk Utility window.
- Test access to the drive by copying a file to the USB Drive