The Dell Latitude 12-5280 Laptop Supports Single Drive Configuration Only. (One 2.5" Solid State Drive or Hard Drive or One M.2 NGFF (2280) Solid State Drive) Note: When a M.2 (2280) Drive is installed, the M.2 Drive occupies the 2.5" Drive bay. If replacing the 2.5" Drive for a M.2 Drive, you will need the M.2 Drive thermal support bracket p/n 3XDN4 and mounting bracket p/n 2FFR0 for installation. If replacing the M.2 Drive for a 2.5" Drive, you will need the 2.5" Drive caddy p/n 6F7DD and cable p/n 6NVFT for installation. This machine also supports a M.2 (2242) in the WWAN slot for caching purpose when Installed with a Hard Drives. (The M.2 slot supports SATA and PCIe NVMe Solid State Drives)