The Dell Precision 17-7760 Mobile Workstation Supports up to 4 Drives. (Four M.2 NGFF (2280) or (2230) Solid State Drives) Note: M.2 slot 6 supports M.2 (2280) PCIe NVMe Generation 4.0 x4 and 3.0 x4 Solid State Drives only and does not support Optane, SATA or M.2 (2230) Solid State Drives. M.2 slots 3, 4 and 5 support M.2 (2280) and (2230) PCIe NVMe Generation 3.0 x4, Optane and SATA Solid State Drives. The M.2 (2230) Drive uses a adapter bracket p/n 07HMH to accommodate for the larger M.2 (2280) slots. (M.2 slot 6 is under the removable door and M.2 slots 3, 4 and 5 are internal and require removing the base cover)