The Lenovo IdeaPad L340-17IWL Laptop Supports up to 3 Drives. (One 2.5" Solid State Drive or Hard Drive in the Internal Primary Bay and/or One M.2 NGFF (2280) or (2242) Solid State Drive in M.2 Slot and One 2.5" Solid State Drive or Hard Drive in the Optical Drive Bay) Note: The Second 2.5" Solid State Drive or Hard is optional and is located in the Optical Drive bay when Installed. The M.2 (2242) Drive uses a adapter bracket p/n 05B40S21899 to accommodate for the larger M.2 (2280) slot. If the 2.5" Drive was not installed from Lenovo, you will need the 2.5" Drive caddy p/n 5B40S21897 for installation. (The M.2 slot supports SATA and PCIe NVMe Solid State Drives)