The Lenovo E41-45 Laptop Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 (2242) Solid State Drive) Note: If the 2.5" Drive was not installed from Lenovo, you will need the 2.5" Drive caddy p/n 5B40Z33009 for installation. (The M.2 slot supports PCIe NVMe Solid State Drives)