Patent ID: 7359191

Claim:
A storage device system comprising: a plurality of host interface control circuit boards for respectively controlling data exchange with a host device; and a memory circuit board useable by said host interface control circuit boards; wherein a prescribed host interface control circuit board of said host interface control circuit boards includes a circuit board, a plurality of circuit components provided on this circuit board and a heat sink; where said heat sink is constituted by integral formation of a main cooling section and at least one airflow guidance section; with the main cooling section provided with a plurality of first heat-radiating fins over the entire length of the heat sink from the airflow inlet towards the airflow outlet; and the at least one airflow guidance section provided so as to extended to both left and right sides of the main cooling section on the outside of said main cooling section along a direction of arrangement of said first-mentioned heat-radiating fins, and including a plurality of other heat-radiating fins formed with narrower pitch than the pitch of said first-mentioned heat radiating fins; a width dimension of said heat sink at the side where the air flows into said heat sink, is set to span the inflow path of air to said host interface circuit board; and in a prescribed heat sink region corresponding to a position of a prescribed circuit component to be cooled by said heat sink, a pitch of said heat-radiating fins is set to be narrower than a pitch of said heat-radiating fins in other heat sink regions of said main cooling section, second heat-radiating fins of shorter length than said first heat-radiating fins are provided between said first heat-radiating fins.