The Dell Alienware 14 Laptop Supports up to 3 Drives. (One 2.5" Solid State Drive or Hard Drive in the Internal Primary Bay and One 2.5" Solid State Drive or Hard Drive in the Optical Drive Bay and One mSATA Solid State Drive in the Internal mSATA Slot) Note: The second 2.5" Drive is optional and is located in the optical drive bay when Installed. If replacing the optical drive for the a second 2.5" Drive, you will need the Dell optical drive bracket p/n 0VP510 and the optical bay drive carrier p/n XY745 and the optical bay drive cable p/n 0X4TJG for installation.