I have the Linkstation 421e and recently moved my 2 4TB disks (RAID0) from it to a new faster NAS. I had two drives that I wanted to install in the now empty Linkstation. One 3 TB drive and One 2 TB. Seeing that the sell sheet showed JBOD was supported I thought a RAID could be built in JBOD mode and then have one Logical Disk of 5 TB. But it seems this is not the case, therefore I am requesting a true JBOD RAID configuration.