Compatible NVMe for Synology DS923+ and other models – NAS Compares
Synology SNV3000 Series NVMe M.2 SSD « Blog | lesterchan.net
What drives are compatible with Synology? – NAS Compares
Info - Synology's "Incompatibility" List ... Yikes! | SynoForum.com - The Unofficial Synology Forum
Amazon.co.jp: Synology DS1621+ 6 Bay Expandable Quad Core CPU with 4GB Memory for Standard Users, Domestic Authorized Dealer, Phone Support Compatible, DiskStation : Computers