Raid 1 and JBOD?

My Cloud OS 3 Personal & Network Attached Storage My Cloud EX Series
3

I cannot answer your questions, but today in the forum for the DL Business Series someone asked a similar question.  So, check both the EX and DL forums for ideas since both devices are very similar (and have the same user manual)…

http://community.wd.com/t5/My-Cloud-Business-Series/DL4100-Adding-new-disks/td-p/886674