The Asus VivoBook Flip J401CA 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. (Models that have the M.2 slot support SATA only Solid State Drives)