The Asus VivoBook Flip 14 TP401MAS Laptop Comes in 2 Different Drive Options from Asus and Supports Single Drive Configuration Only. (One M.2 NGFF (2280) Solid State Drive) or (One eMMC Solid State Flash Drive) Note: Models equipped with a M.2 (2280) Drive are upgradable. Models equipped with a eMMC Flash Drive are not, the eMMC Flash Drive is integrated on the system board and is not upgradable.