I searched and I didn’t find the answer to this, if I missed it please point me in the right direction.

I have a 5 bay high-rely classic backup unit.  They basically mount as hard drives.  The device connects via USB3.  I would like to use Bacula as the backup daemon.  In this case I am not able to wrap my head around challenge. 

How do I tell Bacula to treat certain media as “autoloaded” media and not separate disks  ie /dev/sdx, /dev/sdx.  I want to label the disks via bacula and treat them just as I would a tape?  Thus when it is time to prune it will just prune and tell me which drives to use, as well as request <label> for the daily incremental.   Am I just thinking about this the wrong way?  We are making backups that would need to span across multiple 2 TB disks, hence the autoloader thought process.