Also, if the tape drives are listed as AVR control in the Administration Console Media and Device Management node, there may be a problem with the robotics control. List all drives as robotically controlled (that is, TLD, ACS, and so on). They are converted to AVR control if a problem occurs with the robot. To diagnose the problem, examine the system logs (for example, /var/adm/messages on UNIX systems) for error messages. You can also use the robotic test utilities (such as robtest) to further debug the problem.