The Dell Latitude 3410 Laptop Supports Either 1 or 2 Drives Depending on the Battery Installed. (One 2.5" Solid State Drive or Hard Drive with the Smaller 3-cell 40Whr Battery Installed and/or One M.2 NGFF (2280) or (2230) Solid State Drive) or (One M.2 NGFF (2280) or (2230) Solid State Drive with the Larger 4-cell 53Whr Battery Installed) Note: Models that have the larger 4-cell 53Whr battery installed do not support 2.5" Drives due to the larger battery occupying the 2.5" Drive bay. The M.2 slot supports M.2 (2280) and (2230) Drives by moving the metal mounting bracket to accommodate the form factor. If the 2.5" Drive was not installed from Dell on models with the smaller 3-cell 40Whr battery installed, you will need the 2.5" Drive caddy p/n 0RHY42 and cable p/n 07CR4F for installation. (The M.2 slot supports PCIe NVMe Solid State Drives)