Data cartridge-to-caddy referencing system for a data cartridge handling mechanism within an autochanger

The present invention relates generally to the field of data cartridge storage and handling systems, and more particularly to a portable carrying case or caddy for handling data cartridges. In particular, this invention provides a method and apparatus to enable a cartridge handling mechanism to reference a data cartridge to a data cartridge caddy within an autochanger storage rack in order to return the data cartridge to the data cartridge caddy after the autochanger has finished using the data cartridge. A data cartridge to caddy referencing system for a data cartridge handling mechanism within an autochanger. The referencing system provides X, Y and Z referencing for the data cartridge handling mechanism or the picker of the autochanger as it tries to insert a data cartridge into the data cartridge caddy.