Optional storage insert for Cloud Gateways and UNAS models that supports one 2230, 2242, 2260, 2280, or 22110 sized M.2 NVMe SSD. UCG-Max/Fiber and UNAS-Pro-8/4 products operate at PCIe Gen3x2 per NVMe. UNAS-4 operates at PCIe Gen2x1 per NVMe.