1. A controller for controlling access to media libraries, said controller comprising: a computer processor; a computer memory coupled to the computer processor, the computer memory storing a set of computer instructions executable by the computer processor to: receive a command from the host, wherein the command references a first physical media slot at a first physical media library and a first physical drive; redirect the command from the first physical drive to a second physical drive at the first physical media library; and forward the command to the first physical media library.