The HP ProBook x360 11 G3 EE Notebook Comes in 2 Different Drive Options from HP 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 Solid State 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. (The M.2 slot supports SATA only Solid State Drives)