Synology dx513 20tb 5 x 4tb wd red 5 bay desktop expansion unit
Synology dx513 delivers an effortless solution for volume expansion and data backup for selected synology diskstation models the dx513 seamlessly scales up the storage capacity of the diskstation by an additional 5 hard drives on the fly when connected directly by an expansion cable online volume expansion dedicated local backup solution reliable plug n use design hot swappable hdd design auto power onoff with diskstation models when running out of hard drive capacity on the synology disks