Patent ID: 7131013

Claim:
A power supply control system, comprising: a plurality of power supply circuits for supplying externally a plurality of different drive voltages to loads in a disk array unit driven at the plurality of drive voltages, respectively; a data holding section for holding detected output voltage value data from each of said power supply circuits, separately for each of said power supply circuits, until said data is updated by newly detected output voltage value data from each of said power supply circuits; an error reporting section for checking whether or not the output voltage from each of said power supply circuits is abnormal, separately for each of said power supply circuits, and outputting an error report signal to identify in which power supply circuit the error occurred, if there is a power supply circuit which is judged to be abnormal; and a data update prohibiting section for prohibiting updating of said output voltage value data in said data holding section, if said error report signal is output by said error reporting section, and storing the output voltage value data prior to the occurrence of said error, in a storage section.