A: WHILE IT DOES NOT HURT TO UNPLUG THE DEVICE IT IS NOT NECESSARY. WHEN REMOVING THE SD CARD YOU WANT TO MAKE SURE IT IS NOT RECORDING. TO DO THIS, TURN THE CAMERA/SENSOR AWAY FROM ANY MOTION, WAIT A FEW MINUTES AND THEN REMOVE THE SD CARD. REMOVING THE SD CARD WHILE RECORDING WILL CORRUPT THE CARD AND RESULT IN LOST COLLECTED VIDEO.