The Acer Spin 1 SP118-M Laptop Comes in 3 Different Drive Options from Acer and Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One eMMC Flash Drive) or (One M.2 (2280) Solid State Drive in a Converter Bracket and/or One eMMC Flash Drive) or (One eMMC Flash Drive) Note: Some models equipped with a eMMC Flash Drive have an additional open 2.5" Drive bay. The eMMC Flash Drive is integrated on the system board and can not be replaced. When a M.2 Drive is Installed, the M.2 Drive occupies the 2.5" Drive bay using a converter bracket and interposer converter board. Models with a 2.5" Drive or a M.2 (2280) Drive are upgradable. If the 2.5" Drive was not installed from Acer, you will need the 2.5" Drive bracket p/n 33.VFXN7.001 and cable p/n 50.VFXN7.001 for installation.