Dual M.2 SSD adapter card for outstanding cache performance The Synology M.2 SSD-Adapter M2D18 has been designed to supercharge i/O performance of your NAS. It significantly reduces I/O latency, benefiting applications such as photo indexing, filesearch, and virtualisation environments. The dual M.2 SSD slots support both SATA and NVMe SSD, meaning higher SSD read/write caching and more primary drive bays reserved for data storage. Its flexibility in supporting 2280/2260/2242 form factors and meeting various SSD options saves you from vendor lock-in.