Adding SSD Cache to Synology DiskStation DS918+ with Samsung NVMe M2 SSD -
Amazon.com: Synology 4 bay NAS DiskStation DS918+ (Diskless) : Electronics
Synology has quietly added support for M.2 SSD volumes. This is a huge deal, as Synology previously allowed these slotted SSD drives for cache purposes only, limiting their utility. : r/synology