The Asus ExpertBook B1 B1400CEPNT Laptop Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive) Note: If the 2.5" Drive was not installed from Asus, you will need the 2.5" Drive caddy p/n 13NX03W1AM0201 and flat cable p/n 04022-00110000 for installation. (The M.2 slot supports PCIe NVMe Solid State Drives)