The Lenovo ThinkBook 15 G4 IAP Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2242) Solid State Drive) Note: There are two M.2 slots on the system board and both slots support M.2 2280 and M.2 2242 Drives. The M.2 2242 Drive uses a adapter bracket p/n 5B40S22049 to accommodate for the larger M.2 2280 slot size.