The Dell Inspiron 3581 Laptop Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) or (2230) Solid State Drive) Note: The M.2 (2230) Drive uses a thermal support bracket p/n 0HTHJM to accommodate for the larger M.2 (2280) slot. If the 2.5" Drive was not installed from Dell, you will need the 2.5" Drive bracket and connector for installation. (The M.2 slot supports SATA and PCIe NVMe Solid State Drives)