A robotic guidance mechanism for transporting storage media cartridges along linear and curved routes within a data storage library. The guidance mechanism includes a robotic assembly operating on a guide rail (102). Two guides (202, 204) of the robotic assembly move in two guide paths (302, 304) in the guide rail to route and orient the robotic assembly in a plane defined by the guide rail. A third guide of the robotic assembly engages a guide surface on the guide rail to prevent the robotic assembly from rotating out of the guide rail plane. A picker assembly is provided in the robotic assembly to handle one of the storage media cartridges.
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