The Acer Aspire ES13 ES1-331 Laptop comes in 2 Different Drive options from Acer and Supports Single Drive Configuration Only. (One 2.5" Solid State Drive or Hard Drive) or (One eMMC Solid State Flash Drive) Note: Models equipped with a 2.5" 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.