The Dell Vostro 5635 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 08K28J to accommodate for the larger M.2 (2280) slot. (The Dell Vostro 5635 Laptop supports PCIe NVMe Gen4.0 x4 and Gen3.0 x4 Solid State Drives)