The Acer Aspire 3 A315-21 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 p/n 42.SHXN7.003 and connector cable p/n 50.SHXN7.005 for installation. (The M.2 slot support SATA only Solid State Drives)