A card-type solid state drive (SSD) including: a substrate that has a first surface and a second surface facing each other; a memory controller and a nonvolatile memory device that are on the first surface; a plurality of functional terminals on the second surface; and a plurality of thermal terminals on the second surface, wherein the functional terminals include first-row functional terminals, second-row functional terminals, and third-row functional terminals, wherein at least one of the first-row functional terminals, at least one of the second-row functional terminals, and at least one of the third-row functional terminals are electrically connected to the memory controller or the nonvolatile memory device, and wherein the thermal terminals are not electrically connected to the memory controller or the nonvolatile memory device.