The Acer Extensa 15 EX215-21 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 Acer, you will need the 2.5" Drive bracket and cable for installation. (The M.2 slot supports PCIe NVMe Solid State Drives)