The Dell G3 3590 Gaming Laptop Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) or (2230) Solid State Drive) Note: The M.2 (2280) Solid State Drive has a unique thermal bracket and cannot be interchanged with the (2230) Solid State Drive thermal bracket. The M.2 slot supports M.2 (2280) and (2230) Drives by moving the drive mounting bracket to accommodate the form factor. If the 2.5" Drive was not installed from Dell, you will need the 2.5" Drive caddy p/n 2DVYT and cable p/n 4DK2D for installation. (The M.2 slot supports SATA and PCIe NVMe Solid State Drives)