Installing the Nintendo 64 Expansion Pak.
*** FDS is the only exception, user should push the reset button on system to get back to main menu before than shutting down the system, otherwise FDS save data will be lost. Cut from top edge of each PowerPak is a notch through which a standard compact flash (CF) card may be conveniently inserted or removed. It is a gray mat with twelve pressure-sensors embedded between two layers of flexible plastic.