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)