To format the microSD card for the Contour ROAM3 follow these steps:
1) Open the back of the camera.
2) Check that the Record Slider is in the OFF position.
3) Insert the microSD card securely in to the camera's card slot.
4) Press and hold the Format Button until the microSD card LED begins flashing yellow.
5) Release the Format Button.
6) When the microSD card turns green, the card is formatted and ready to use.
Warning: Formatting the microSD card will erase all data on the card.