The Acer Nitro 5 AN515-55 Laptop Supports up to 3 Drives. (One 2.5" Solid State Drive or Hard Drive and/or Two M.2 NGFF (2280) Solid State Drives) Note: M.2 slot 1 (SSD1) supports PCIe NVMe Solid State Drives and M.2 slot 2 (SSD2) supports SATA and PCIe NVMe Solid State Drives. If the 2.5" Drive was not installed from Acer, you will need the 2.5" Drive bracket p/n 33.Q5AN2.002 and cable p/n 50.Q5XN2.002 for installation.