AT&T RADIANT Core User Manual page 20

Format an SD card
When you insert an optional SD card for the first time, it is recommended that
you format it on your phone. When formatting an SD card, you should back
up your music and photo files that are stored on the card as formatting the
SD card deletes all the stored data.
1. From the home screen, swipe up to access Apps, and tap Settings
.
2. Tap Storage > SD card.
3. Tap to access options menu, and tap Storage settings.
4. Select Format or Format as internal, and then tap FORMAT SD CARD to
confirm.
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