The Acer TravelMate B1 TMB114-21 Laptop comes in 3 Different Drive Options from Acer and Supports Single Drive Configurations only. (One 2.5" Solid State Drive or Hard Drive) or (One M.2 NGFF (2280) Solid State Drive) or (One eMMC Flash Drive) Note: Models that came with a eMMC Flash Drive installed, The eMMC Flash Drive is integrated on the system board and can not be replaced. Models with a 2.5" Drive or a M.2 (2280) Drive are upgradable. (The M.2 slot supports PCIe NVMe Solid State Drives)