A data storing method for non-volatile memory is provided, wherein the non-volatile memory includes at least one memory block having a plurality of strong pages and weak pages. In the bio-item searching apparatus, the storage device stores a bio-item literature set having a literature in which the bio-item name is described for each of bio-items. A controller of magnetic material can be placed on the opposite side of the substrate to control the movement of the magnets. The differential signal is provided by the low voltage circuit responsive to a feedback signal from the high voltage circuit. The apparatus basically controls the switches through control algorithm circuit to get the information of LED driver output pins voltage and compare them with two reference voltages to determine the openshort condition of individual LED.