The base configuration is 256GB SSD
The optional 4 configurations are:
128GB M.2 PCIe NVMe Solid State Drive + 1TB 5400RPM 2.5" SATA Hard Drive,
256GB M.2 PCIe NVMe Solid State Drive + 1TB 5400RPM 2.5" SATA Hard Drive,
512GB Solid State Drive (Boot) + 1TB 5400RPM Hard Drive (Storage), or
512GB M.2 PCIe NVMe Solid State Drive