Abstract: A storage controller and method are provided. The storage controller includes control sections including storage sections into which data transmitted from a host unit is cached, one of the control sections being a main control section which controls firmware update in the control sections. The main control section includes an instruction updater sending an update instruction to a sub control section in the control sections in which firmware is to be updated, and an area instructor requesting the sub control section to transmit area information, the sub control section including an area information obtainer obtaining, according to the instruction from the area instructor and an area information transmitter transmitting to the area instructor; and an area setter setting the location of the cache area in the storage section on the basis of the instruction.