US Patent 7021883 System and method for transporting media cartridges

An invention for use with transporting media cartridges between a first storage library and a second storage library. The invention comprises at least two pass through ports connecting the first and second storage libraries for use in transporting media cartridges between the first and second storage libraries. The at least two pass through ports provide redundant operation of the multiple data storage library system to ensure media cartridge transportability between the first and second storage libraries in the event that one of the at least two pass through ports should become inactive.