Samsung SCH-L710RWBXAR - Manual (Page 132)

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Formatting a Memory Card
Use the Erase SD card setting to remove all content from an
installed memory card.
1. From the Home screen, touch Menu ➔ Settings.
2. Under Device, touch Storage.
3. Under SD card, touch Format SD card, then follow the
prompts to confirm the deletion of information from the
card.