The Acer TravelMate B3 TMB311-31 Laptop comes in 2 Different Drive Options from Acer and Supports Single Drive Configuration Only. (One M.2 NGFF (2280) Solid State Drive) or (One eMMC Flash Drive) Note: the eMMC Flash Drive is integrated on the system board and is not upgradable. The M.2 (2280) Drive is upgradable. Please verify what type drive your model supports before ordering