storage unit density

Hi All,

i have a robot with 3 different tape drives types.

now i neeed to configure it in NBU.

i know that density must match between st unit,media and drive.

I have configured robot and under storage device column in storage unit tab,it is showing dlt2.

My query is how to configure storage unit with different density as st unit type cannot be changed.

NBU 7.1

LINUX