Abstract: An automated cartridge library has an essentially rectangular library frame which includes a frame front wall (22) and a frame back wall (24), and a library door (30) provided on the frame front wall. A transport actuator and guide region (90) is provided within the frame, the transport actuator and guide region including both a guideway along which a cartridge transport assembly (92) reciprocates and an actuator (124) which causes the cartridge transport assembly to rotate from a first transport position to a second transport position. A library front section includes a cartridge magazine cavity (50) and a entry/exit port module (54). A library rear section includes a region for tape drives (60) and an auxiliary cartridge magazine (70). Cartridge magazines (64) are insertable into the cartridge magazine cavity when the library door is opened so that a reference surface of the cartridges face the transport actuator and guide region.

Abstract: An automated cartridge library (30) has plural cartridge receiving units which are precisely locatable so that a transport device (300) can accurately move a cartridge (90) between at least two of the cartridge-receiving units. The cartridge-receiving units and/or calibration cartridges inserted therein have an indicia (190) which is of contrasting reflectivity, the indicia having at least two sides (191, 192) which meet at a vertex (193). An illumination source (340) on the cartridge transport device makes two sweeps (Y1, Y2) of an illuminating beam over the indicia. Illumination transitions as detected by a sensor (350) during the two sweeps are used to determine a location of the indicia vertex (193). In the case of a cartridge-receiving unit being a multi-celled cartridge magazine, a rear wall (220) of the magazine has an aperture (222) for each cell.