External data storage device

An external data storage device comprising:

• a memory module including a plurality of semiconductor chips suitable for storing data received from an external device;
• a case including a plurality of surfaces surrounding the memory module;
• and
• a case stand suitable for supporting the case in a vertical direction on a ground,
• wherein the plurality of surfaces includes:
• a first planar surface and a second planar surface having the largest sizes among the plurality of surfaces;
• a first long-side surface and a second long-side surface, which contact the first and second planar surfaces, are parallel in a first direction and face each other;
• and
• a first short-side surface and a second short-side surface, which contact the first and second planar surfaces, are parallel in a second direction perpendicular to the first direction and face each other, and
• wherein the case further includes:
• a connector hole formed on a first end portion of either the first short-side surface or the second short-side surface, and configured to expose a connector of the memory module;
• and
• first and second case coupling portions each having a cylindrically shaped opening formed in a second end of a corresponding long-side surface of the first and second long-side surfaces.