The Dell Latitude 7440 Laptop Comes in 2 Different Drive Options from Dell and Supports Single Drive Configuration Only. (One 2.5" Solid State Drive or Hard Drive) or (One mSATA Solid State Drive in the Adapter Caddy) Note: The mSATA Drive and the 2.5" Drive are Installed in the same location using different drive caddys. If replacing the mSATA Drive for a 2.5" Drive, you will need the 2.5" Drive caddy p/n 0WPRM and Isolation rubber p/n H42Y3 for installation. If replacing the 2.5" Drive for a mSATA Drive, you will need the mSATA adapter caddy p/n FCN4M for installation. The mSATA caddy and the 2.5" Drive caddy use the same data cable p/n 6520J to connect to the system board.