A storage library which enables capacity expansion without additional
robotics hardware includes a frame, first and second modules having
respective cells, and a robot. The frame supports the first module at a
first frame length position such that the first cells are positioned at
the first frame length position and along the periphery of a channel
extending within the frame interior through the frame length. The frame
supports the second module when the second module is mounted to the frame
such that the second cells are positioned at the second frame length
position and along the channel periphery. The robot has a support
connected to the frame and a picker movably connected to the support. The
picker moves through the channel to manipulate media elements held by the
first cells, and to manipulate media elements held by the second cells
when the second module is mounted to the frame.
