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How do I safely remove the microSD™ card on my Samsung Galaxy S™ 4G?
To safely remove 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 SD card and Phone Storage. Your microSD card’s information is shown on this screen. To prepare the card for safe removal, touch Unmount SD card. Your device will close any applications that are currently using the card. Wait for the process to complete before removing the card.