The Acer Predator GX21-71 Laptop Supports up to 5 Drives. (One 2.5" Solid State Drive or Hard Drive and/or Four M.2 NGFF (2280) Solid State Drives) Note: All Four M.2 slots support SATA Solid State Drives and Two M.2 slots support 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.