The Asus VivoBook Go 15 E510KA Laptop comes in 3 Different Drive options from Asus and Supports Single and Dual Drive Configurations. (One M.2 NGFF (2280) Solid State Drive) or (One eMMC Solid State Flash Drive) or (One M.2 NGFF (2280) Solid State Drive and One eMMC Solid State Flash Drive) Note: Some models with a eMMC Solid State Flash Drive do not have the additional M.2 slot on the system board. verify there is a M.2 slot on the system board before ordering. Models that have a eMMC Solid State Flash Drive only are not upgradable, the eMMC Flash Drive is integrated on the system board and can not be upgraded. Models with a M.2 slot, the M.2 Drive is upgradable. (Models that have the M.2 slot support PCIe NVMe Solid State Drives)