The Lenovo ThinkPad P53 Laptop Comes in 2 Different Storage Options Depending on the Graphics Card Installed and Both Options Support up to 3 Drives. (Two M.2 (2280) Solid State Drives and/or One 2.5" Solid State Drive or Hard Drive with the NVIDIA Quadro T1000/T2000 Graphics Card) or (Three M.2 (2280) Solid State Drives with the NVIDIA Quadro RTX 3000/4000/5000 Graphics Card) Note: The 2.5" Drive is only available on models with a NVIDIA T1000 or T2000 Graphics Card installed. (The M.2 slots support PCIe NVMe Solid State Drives)