<p>A storage apparatus and program update method for reducing tediousness and complications of drive inventory management. A storage apparatus 10 includes a disk unit 400 composed of a plurality of first drives 420 storing first firmware of the same type, a controller 100 for controlling data during operation of the first firmware, a relay device 300, and a second drive 520. Then, the second drive 520 stores second firmware of the same type as that of the first firmware and third firmware of a type different from that of the first firmware. The controller 100 includes: a firmware comparison unit for comparing the first firmware with the second firmware; a firmware comparison unit for deciding firmware to operate on the storage apparatus 10 based on the comparison result; and a firmware update unit for updating the firmware operating on the first drive 420 or the second drive 520 with the decided firmware.</p>
