The Dell Latitude 5421 Laptop Supports Single Drive Configuration Only. (One M.2 NGFF (2280) or (2230) Solid State Drive) Note: The M.2 (2230) Drive uses a adapter bracket p/n 07HMH to accommodate for the larger M.2 (2280) slot. If replacing the M.2 (2230) Drive for a M.2 (2280) Drive, you will need the M.2 (2280) Drive thermal plate p/n 85J62 for installation. (The M.2 slot supports PCIe NVMe Solid State Drives)