The Lenovo N24 Winbook Laptop Comes in 3 Different Drive Options from Lenovo 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 Drive do not have the additional M.2 slot on the system board. Models that have a eMMC Flash Drive only are not upgradable, the eMMC Flash Drive is integrated on the system board and can not be upgraded or replaced. Models with a M.2 slot are upgradable. (The M.2 slot supports SATA only Solid State Drives)