Abstract: An apparatus for mounting a magazine, containing multiple data cartridges, in a cartridge access port of an automated library. The magazine contains multiple cam followers that engage multiple cam profiles inside the cartridge access port. These cam followers and cam profiles allow the magazine to be positioned vertically for normal operation, and horizontally for installation and removal of individual cartridges. Each cam profile has an open end to allow the magazine to be completely removed from the cartridge access port. Cam profiles are established by grooves in the side walls of the cartridge access port, or by ridges protruding from those side walls. The cam followers are pins protruding from the sides of the magazine. In the alternative, the cam followers may be mounted inside the cartridge access port while the cam profiles are established on the magazine.