The Acer Predator Helios 500 (PH517-61) 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 SATA only 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 and cable for installation.