Andy23713 years ago000Can I also operate the dx517 with "only" 3 discs or do I have to "fill" all the slots straight away?Show in original language (German)gschwinds3 years ago+330 Helpful answerYou can also use only 3 hard disks or any other number, simply a maximum of 5.Just to be on the safe side. Is there a Synology NAS where this ->Expansion Unit<- is connected? It won't work on its own.Show in original language (German)Comment2 comments