Patent ID: 6977813

Claim:
A disk array system, comprising: a controller having a plurality of circuit boards including a channel adaptor board, a switch board, a cache board and a disk adaptor board; a disk device controlled by said controller; a power supply section to supply a power to said circuit boards; and a fan for the ventilation in the system, wherein each of said circuit boards has objects to be cooled including at least one of an electronic component and a wiring area thereon, and said each circuit board is stored in a logic box in a state of being fitted with a heat sink with interposing a block with high conductivity therebetween, said heat sink has a base part having a connection flat surface which covers the whole of the upper flat surfaces of said objects to be cooled and has radiator fins, and said block has a shape coming in contact with the upper surfaces of the objects to be cooled on said each circuit board, and the connection flat surface of said heat sink and transmits a heat of said objects to be cooled to said heat sink.