The Asus K6501ZM Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) Solid State Drives) Note: The primary M.2 (SSD1) slot supports PCIe NVMe Generation 4.0 x4 and 3.0 x4 Solid State Drives and the secondary M.2 (SSD2) slot supports PCIe NVMe Generation 3.0 x4 Solid State Drives.