The HP 15 TouchSmart Notebook 15z-g300 -CTO- Comes in 2 Different Drive Options from HP and Supports Single Drive Configuration Only. (One 2.5" Hard Drive) or (One M.2 NGFF (2280) Solid State Drive using a Adapter Board) Note: When the M.2 (2280) Drive is installed, the M.2 Drive occupies the 2.5" Drive bay using a adapter board. If replacing the M.2 Drive for a 2.5" Drive, you will need the 2.5" Drive bracket p/n 749648-001 for installation. If replacing the 2.5" Drive for a M.2 Drive, you will need the M.2 Drive bracket and M.2 Drive board for installation. (The M.2 Drive board supports SATA only Solid State Drives)