A data storage library features multipurpose slots each configured to receive a media drive (operable to read/write data from/to media removably loaded into the media drive) a command relay port (operable to convey media transport signals from a host to a shared robotic media transport device), or various other modules. The robotic device is programmed to recognize whether each slot is empty or whether it is filled with a component such as a media drive or a command relay port, and to thereafter communicate with the occupant appropriately.