The Asus GU603HM Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) Solid State Drives) Note: M.2 slot 1 (SSD-1) support PCIe NVMe Generation 4.0 x4 and 3.0 x4 Solid State Drives and slot 2 (SSD-2) supports SATA and PCIe NVMe Generation 3.0 x4 Solid State Drives.