The HP 17g Notebook 17g-br100tx Comes in Different Drive Options from HP and Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive Installed on System Board) or (One M.2 NGFF (2280) Solid State Drive using a M.2 Drive holder and/or One M.2 NGFF (2280) Solid State Drive Installed on System Board) Note: When the M.2 (2280) Drive is installed in the M.2 Drive holder, the M.2 Drive holder occupies the 2.5" Drive Bay. If replacing the M.2 Drive in the M.2 Drive holder for a 2.5" Drive, you will need the 2.5" Drive holder p/n 905974-001 for installation. If replacing the 2.5" Drive for a M.2 Drive in the 2.5" Drive Bay, you will need the M.2 Drive holder p/n 858260-001 and M.2 Drive board p/n 856614-001 for installation. (The M.2 Drive Board and the M.2 Slot on System Board Support SATA Only Solid State Drives)