A hard drive casing for accommodating a hard drive includes a case body and a cover body. The cover body has a base wall and a peripheral wall surrounding the base wall. The case body accommodates the hard drive therein. The peripheral wall has a handle arranged on an outer surface thereof. The cover body is adapted to cover the case body. The cover body is pivotally coupled to the case body. The cover body has a plurality of ribs arranged thereon. The ribs protrude towards the case body. The ribs and the base wall define a gap therebetween, and the gap has a width smaller than a thickness of the hard drive.