A storage control device comprises: a first I/O control unit for
controlling read/write of data from/to one or more HDDs (Hard Disk
Drives); a second I/O control unit whose current consumption is
approximately equal to that of the first I/O control unit; two or more
first power supply devices supplying electric power to the first I/O
control unit; two or more second power supply devices supplying electric
power to the second I/O control unit; and at least three circuit breakers
receiving electric power supplied from outside and supplying the electric
power to the first and second power supply devices while interrupting the
supply of the electric power when current exceeding a preset level
passes. Each of the first/second power supply devices includes a current
balancing circuit for equalizing output currents of the first/second
power supply devices.