The Dell Alienware 13 Laptop Comes in 2 Different Drive Options from Dell and Supports Single or Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive) or (Two M.2 NGFF (2280) Solid State Drives) Note: When the M.2 (2280) Drives are Installed, they occupy the 2.5" Drive bay by using a Interposer converter board. If replacing the M.2 Drives for a 2.5" Drive, you will need the 2.5" Drive caddy p/n 8VHGX and cable p/n 01P0XW for installation. If replacing the 2.5" Drive for the dual M.2 Drive option, you will need the M.2 dual drive Interposer converter board p/n 0G8C4P and cable p/n A1548G for installation. (Both M.2 Slots on the converter board support SATA only Solid State Drives)