The Dell Latitude-7400 2-in-1 Laptop Supports Single or Dual Drive Configurations Depending on the WWAN Card Installation. (Dual Drive Option: One M.2 NGFF (2230) Solid State Drive in Slot 3 and/or One M.2 NGFF (2230) Solid State Drive in the WWAN Slot 2) or (Single Drive Configuration: One M.2 NGFF (2280) Solid State Drive in Slot 3 with no WWAN Card Installed) Note: If the M.2 (2280) Drive is installed in Slot 3, the larger M.2 (2280) Drive occupies part of the WWAN slot. (M.2 slot 2 supports M.2 (2230) PCIe NVMe 3.0 x2 Drives and M.2 slot 3 supports M.2 (2280) and (2230) SATA and PCIe NVMe 3.0 x4 Drives)