The HP 250 G9 Notebook Comes in 3 Different Storage Configurations from HP and Supports Single or Dual Drive Configurations. (Models Equipped with a Intel Pentium N6000 or Celeron N4500 Support: One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) PCIe Solid State Drive Installed on the System Board) or (Models Equipped with a Intel Pentium N6000 or Celeron N4500 Support: One 128GB M.2 NGFF (2280) SATA Solid State Drive using a M.2 Drive Bracket and/or One M.2 NGFF (2280) PCIe Solid State Drive Installed on the System Board) or (Models Equipped with a Intel Celeron N4500 with a 64GB eMMC Flash Drive Support: One 2.5" Solid State Drive or Hard Drive and/or One 64GB eMMC Solid State Flash Drive) Note: Models that have the 64GB eMMC Flash Drive do not have a M.2 slot on the system board and the eMMC Flash Drive is integrated on the system board. When the M.2 (2280) SATA Drive is installed in the M.2 Drive adapter bracket, the M.2 Drive occupies the 2.5" Drive bay. If replacing the M.2 SATA Drive in the adapter bracket for a 2.5" Drive, or adding a 2.5" Drive, you will need the 2.5" Drive caddy p/n Lxxxxx-001 and Drive board p/n L52024-001 and cable p/n L52025-001 for installation. (The M.2 Drive adapter bracket/board supports SATA only Solid State Drives and the M.2 slot on the system board supports PCIe NVMe Solid State Drives)