The Acer TravelMate Spin B3 B311R-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) Solid State Drive is upgradable. Please verify what type drive your machine supports before ordering. (When present, the M.2 slot supports SATA and PCIe Solid State Drives)