Unpopulated WD MyBook Duo

I want to use this enclosure to take my drives as simple JBOD. Pop drives in and nothing appears on the desktop. So realise maybe I need to go through the WD utility. Click on RAID settings and click on JBOD mode, software ask me to reformat. Is it possible to do this without erasing?

Edit, it would still be nice to have the drives appear on desktop, without having to go through the WD software, any ideas?

I think I got it, have to erase the drives from within the software, shame really, means I have to copy a ton of data to the new drives instead of just dropping the data drives in. So I guess also that once formatted inside the WD box, these drives will be useless in another drive box…we shall se!