The Dell Latitude 3580 Laptop Comes in 2 Different Drive Options from Dell and Supports Single Drive Configuration Only. (One 2.5" Solid State Drive or Hard Drive) or (One M.2 NGFF (2280) Solid State Drive) Note: The M.2 Drive and the 2.5" Drive are Installed in the same location using different drive caddys. If replacing the M.2 Drive for a 2.5" Drive, you will need the 2.5" Drive caddy p/n MH1RJ for installation. If replacing the 2.5" Drive for a M.2 Drive, you will need the M.2 Drive caddy p/n RWMDF for installation. The M.2 Drive caddy and the 2.5" Drive caddy use the same data cable p/n 58GJC to connect to the system board. (The M.2 slot supports SATA only Solid State Drives)