This is how to format the DJI Phantom 4 microSD card. Ensure that all content that may exist on the microSD card have been backed up first, as performing this procedure will erase everything from the card. It’s important to format the microSD card before initial use with the DJI Phantom 4, as it conditions the microSD card to perform optimally with the Phantom 4. A microSD card that has already been formatted in a computer MAY work but it likely won’t perform optimally.