Disk array device

A disk array device comprising:

• a plurality of hard disk drive modules each having a disk drive for recording data;
• a controller module having a controller that controls writing/reading data into/from the disk drives;
• a power supply module that supplies power to the plurality of hard disk drive modules and the controller module;
• a plurality of fan modules having respective fans that cool the plurality of hard disk drive modules, the controller module, and the power supply module;
• a chassis housing the plurality of hard disk drive modules provided on a front side thereof, and the controller module, the power supply module, and the plurality of fan modules provided on a back side thereof, the controller module and the power supply module being placed between the plurality of fan modules;
• and
• a circuit board, in the chassis, connected via connecters provided on a surface thereof on the front side to the plurality of hard disk drive modules and connected via connecters provided on another surface thereof on the back side to the controller module, the power supply module, and the plurality of fan modules;
• wherein the fan modules are the same in shape, and of the fan modules, one fan module is placed upside down with respect to an other fan module.