The Lenovo ThinkBook 14s Yoga ITL Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2242) Solid State Drives) Note: The M.2 (2242) Drive uses a adapter bracket p/n 02DL954 to accommodate for the larger M.2 (2280) slots. (The primary M.2 slot SSD1 supports Generation 4.0 x4 and 3.0 x4 PCIe NVMe Drives and the secondary M.2 slot SSD2 supports Generation 3.0 x2 PCIe NVMe Drives)