We have a 9407-515 V6R1M1, SLR60 Tape drive. We used to be able to do an entire system backup (unattended) on an SLR60 tape. It now wants a second tape. After inserting the second tape how do I get it to resume the save? It just sits there like it wants a message answered but I can't get to any message if there is one there. What am I doing wrong or any ideas on how to do this?