The HP Envy M7 TouchSmart Notebook m7-j178ca Supports up to 3 Drives. (Two 2.5" Solid State Drives or Hard Drives and/or One mSATA Solid State Cache Drive) Note: If the second 2.5" Drive was not installed from HP, you will need the 2.5" Drive hardware kit p/n 720237-001 for installation.