The Acer Extensa 15 EX215-54 Laptop Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive) Note: If the 2.5" Drive was not installed from Acer, you will need the 2.5" Drive caddy p/n 33.A6MN2.001 and connector cable p/n 50.A9BN2.001 for installation. The M.2 slot on the system board supports Generation 3.0 x4 NVMe Drives. If installing a Generation 4.0 x4 NVMe Drive, the drive will run at Generation 3.0 x4 speeds.