The Acer ConceptD 5 Pro CN517-71P 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: Both M.2 slots support PCIe NVMe 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 and cable for installation. (Supports TPM OPAL Encrypted Solid State Drives)