Patent ID: 7978433

Claim:
A recording-medium driving device comprising: an opening through which a casing containing at least a recording medium is insertable and ejectable; a chassis that supports the casing inserted into the opening and that has a connector portion electrically connectable to the recording medium; and a conveying mechanism that conveys the casing in a moving direction between the opening and an inward section of the device, wherein one of surfaces of the casing has four corners provided with left and right projections, the left and right projections being positioned bilaterally asymmetrical with respect to a center line passing through a center of the recording medium and extending parallel to the moving direction, and wherein the chassis has a top surface facing an upper surface of the casing and a pair of left and right bottom surfaces extending in the moving direction and respectively supporting opposite edges of a lower surface of the casing, one of the bottom surfaces having a width smaller than that of the other bottom surface.