The Dell Latitude 3140 Laptop Comes in 2 Different Drive Options from Dell and Supports Single Drive Configuration Only. (One M.2 NGFF (2230) Solid State Drive) or (One 64GB eMMC Solid State Flash Drive) Note: Models equipped with a M.2 (2230) Solid State Drive are upgradable. Models equipped with a 64GB eMMC Flash Drive are not, the 64GB eMMC Flash Drive is integrated onto the system board and cannot be replaced or upgraded. (The Dell Latitude 3140 Laptop supports PCIe NVMe Gen4.0 x4 and Gen3.0 x4 Solid State Drives)