The Asus BR1100CK Rugged Notebook Comes in 3 Different Drive Options from ASUS and Supports Single and Dual Drive Configurations. (One M.2 NGFF (2280) Solid State Drive) or (One eMMC Solid State Flash Drive with One Empty M.2 Slot) or (One M.2 NGFF (2280) Solid State Drive and One eMMC Solid State Flash Drive) Note: eMMC Flash Drives are integrated on the system board and are not upgradable or removeable.