Patent ID: 7236326

Claim:
A mechanism for preventing incorrect loading of a data cartridge into a cell in an input/output station, the cartridge having a front face with a recessed angled surface, and the cell having a bottom surface facing a cavity adapted to receive the cartridge, comprising: a hinged flap placed within the bottom surface of the cell and mounted to the bottom surface at a rotatable first end, and a second end incorporating a first flat surface substantially orthogonal to the bottom surface, the hinged flap including a ramp surface, and a second, angled flat surface between the first flat surface and the ramp surface, wherein: the second, angled flat surface forms an angle φ with the bottom surface as measured at a vertex formed by the second flat surface and the bottom surface, the angle φ corresponding to an angle of the recessed angled surface of the cartridge to force the hinged flap toward the bottom surface of the cell.