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
How to add an SSD cache to your Synology NAS (and why you'd want to) | TechRepublic
Amazon.com: Synology DiskStation DS918+ NAS Server for Business with Intel Celeron CPU, 8GB Memory, 256GB SSD, 8TB HDD, DSM Operating System : Electronics
Synology SSD Cache Setup and Testing - YouTube
SSD Cache: Expectations vs. Reality. How does this actually work? | Synology Community
DiskStation® DS423+ | Synology Inc.
SYNOLOGY DS918 +: a complete disassembly in rules - iFixit Repair Guide
Adding SSD Cache to Synology DiskStation DS918+ with Samsung NVMe M2 SSD -
Synology DS918+ SSD Cache Install and Is it worth it? - YouTube