Select Tape drive (when two drives aer installed)

Hi all,

I have a backup exec 2012 media server with Library Expansion Option installed and I got two tape drives insalled in my tape loader. How can I chose the drive out of two when I create a backup job. There is no drop down in the "Storage" section of backup create dialog. Please help me to come out of this problem.

Regs,

Sachitha.