The Dell G15 3579 Gaming Laptop 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) Note: If the 2.5" Drive was not installed from Dell, you will need the 2.5" Drive caddy p/n K2HV9 and cable p/n CMXVW for installation. If replacing the M.2 SATA Drive to a M.2 PCIe NVMe Drive, you will need the M.2 thermal support bracket p/n HM4TX for installation. (The M.2 slot supports SATA and PCIe NVMe Solid State Drives)