The Asus VivoBook Flip R518UB (DDR4) Laptop Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive) Note: If the 2.5" Drive was not installed from Asus, you will need the 2.5" Drive support bracket and the HDD controller card for installation. (The M.2 slot supports SATA only Solid State Drives)