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How do I format the MicroSD™ card on my TracFone Samsung Galaxy S® II?
To format the microSD™ card on your mobile device, you must first unmount the microSD card. To unmount the microSD card, touch the Applications icon and scroll to and touch Settings. Then scroll to and touch Storage.
Your microSD card’s information is shown on this screen. To prepare the card for formatting, touch Unmount SD card. Your device will close any applications that are currently using the card. Wait for the process to complete.
When the device has finished unmounting the card, you will be able to select the option Format SD card.