Hi,
You need to see all the drives at once ?
In Directory Opus 4 you have some buttons banks, and they can be cycled. To cycle a bank of drives buttons, just click over them with the right mouse button.
All you have to do, is configure tha banks in the order you want, with the most used disks first, and if you need some drive not so often used, click over the drives buttons with the right mouse button, to cycle through the banks.