The HP Envy M7 Notebook m7-u009dx Supports Either 1 or 2 Drives Depending on the System Board Installed. (One 2.5" Solid State Drive or Hard Drive) or (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive) Note: select models have an additional M.2 NGFF (2280) Drive Slot. Please verify your Motherboard has a M.2 Slot before ordering a M.2 Drive. (When present, the M.2 slot supports SATA only Solid State Drives)