Ubiquiti UNAS Pro 4 SKU : UNAS-Pro-4 Tech Specs: Click Here Description: 1U rack-mount NAS with (4) 2.5/3.5' HDD bays and (2) M.2 NVMe SSD cache slots, delivering faster access, lower latency, and high-availability 10 Gbps networking for large-scale file storage and sharing.