The HP Envy 15 Notebook 15-ae125tx Supports Either 1 or 2 Drives Depending on the Graphics Card Installed. (Dual Drive Option with 4GB of Discrete Graphics Card: One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive) or (Single Drive Option with any other Graphics Card: One 2.5" Solid State Drive or Hard Drive) Note: If present, the M.2 slot supports SATA only Solid State Drives.