A. Load differential tape
B. Verify backup
C. Load new tapes
D. Perform a full backup

A.Install one drive on the first channel and install the second drive on the second channel.
B.Install one drive on the first cable， on the first channel. Install the second drive on the secondcable， on the second channel.
C.Install both drives on the same channel. Cable both drives as the primary master on the samecable.
D.Install both drives on the same channel. On the same cable one drive should be set as primaryslave and the other drive as the primary master.