Abstract: A robotic shuttle for moving a storage media cartridge from a first location to a second location in a storage library subsystem, said robotic shuttle riding on a linear bearing surface in the storage library subsystem. The shuttle has a frame with at least two ports for receipt and discharge of the storage media cartridge. A rocker beam is rotatably attached to said frame, with one end of the beam protruding from one of the ports and the other end of the beam protruding from the other of said ports. The beam is fitted with rotating drive rollers that move the storage media cartridge when they come into contract with it. The direction of movement of the cartridge depends upon the direction of rotation of the drive rollers.

Abstract: A computer data storage cartridge magazine for carrying data storage cartridges from conventional "off-line" storage to a storage library subsystem where cartridges may be electronically read or written. The magazine comprises a series of horizontally arranged slots. Each slot has a front spring lever which is operated by the user to insert and remove individual cartridges and a rear locking lever which is operated by the robotic mechanisms of the library subsystem. A safety bar extends substantially the length of the magazine and is located under the rear locking levers. The safety bar acts to ensure that the rear locking levers do not become accidently depressed when the magazine is carried by the user. The safety bar is disengaged by a mated pin when the magazine is inserted into the library subsystem. The rear locking levers may then be actuated (depressed) by an arm on the robotic mechanism of the library subsystem.

Abstract: A storage library subsystem comprising a frame, a robotic shuttle attached to and linearly movable relative to the frame, a media read/write device attached to the frame, and a storage media cartridge magazine attached to the frame. The robotic shuttle is provided with a plurality of ports for receipt and ejection of storage media cartridges. The media read/write device is disposed opposite a first port of the robotic shuttle at a first point of the linear movement of the robotic shuttle so that a storage media cartridge may be passed between the device and the robotic shuttle at the first point of linear movement. The magazine has at least one slot for storage of a storage media cartridge, the slot being disposed opposite a second port of the robotic shuttle at a second point of the linear movement of the robotic shuttle so that a storage media cartridge may be passed between the slot and the robotic shuttle at the second point of linear movement.

Abstract: A method and associated apparatus within a storage library subsystem for utilizing a single light source in combination with a single reflectivity sensor for multiple functions within the storage library subsystem. A laser light source and reflectivity sensor are mounted adjacent one another on the moveable robotic gripper hand internal to the storage library subsystem. The multiple sensing methods and apparatus of the present invention include use of the apparatus for calibrating the robotic positioning mechanisms to permit more tolerance for manufacturing variability, use of the apparatus to sense presence or absence of a magazine or cartridge within the library, and use of the apparatus for reading and decoding barcoded labels on the face of cartridges within the library. Use of a single, simple apparatus for these multiple purposes and functions permit reduction in the complexity of the library subsystem and therefore a reduction in the associated costs.