The Acer Predator G9-792 Laptop Supports Either 2 or 3 Drives Depending on the Revision / Variant. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive) or (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive and (Some Variants) One M.2 NGFF (2210) Solid State Drive) Note: M.2 slot 1 supports M.2 (2280) SATA and PCIe NVMe Solid State Drives. M.2 slot 2 (if present) supports M.2 (2210) SATA only Solid State Drives. You can install a M.2 (2280) SATA Drive in slot 2 by using a adapter bracket p/n 33.Q04N5.001 to accommodate for the larger M.2 (2210) slot. If the 2.5" Drive was not installed from Acer, you will need the 2.5" Drive bracket and cable for installation. (Some variants of this model have Two M.2 slots, most variants have only One M.2 slot)