The HP Spectre 15 XT TouchSmart Ultrabook 15-4100ep Supports Single and Dual Drive Configurations. (One 2.5" Hard Drive and/or One mSATA Solid State Drive) Note: If the 2.5" Drive was not installed from HP, you will need the 2.5" Drive hardware kit p/n 700805-001 (Includes: 2.5" Drive mounting bracket, cable and screws) for installation.