The Acer Predator Helios 500 (PH517-52) Gaming Notebook 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: Both M.2 slots support PCIe NVMe Gen4.0 x4 Solid State Drives and can be set up as RAID Drives. If the 2.5" Drive was not installed from Acer, you will need the 2.5" Drive bracket p/n 42.SHXN7.003 and cable p/n 50.GNPN7.005 for installation.