Memory system

A memory system comprising:

• a printed circuit board having a first surface and a second surface, the second surface being an opposite surface of the first surface, the printed circuit board having a first end portion and a second end portion, the second end portion being a portion arranged in an opposite side of the first end portion;
• a semiconductor memory and a controller both disposed on the first surface;
• an edge connector connectable to a host device, the edge connector being disposed in the first end portion;
• plural through-hole portions disposed in the second end portion, each penetrating from the first surface to the second surface, each having an inner surface covered with an electrically-conductive film;
• and
• plural pad electrodes disposed on the second surface in the second end portion, wherein
• at least some of the plural through-hole portions are electrically connected to the controller, and
• at least some of the plural pad electrodes are electrically connected to the controller.