The Asus E1504GA Laptop Comes in 2 Different Drive Options from ASUS and Supports Single Drive Configuration Only. (One M.2 NGFF (2280) Solid State Drive) or (One UFS 2.1 Solid State Flash Drive) Note: Models that have a UFS 2.1 Solid State Flash Drive installed are not upgradable, the UFS 2.1 Flash Drive is integrated onto the system board and can Not be removed. Models with a M.2 2280 Solid State Drive installed are upgradable and replaceable. We recommend to verify what type Solid State Drive your model has installed before ordering.