The HP Envy 17 Notebook 17-r101nl Supports up to 3 Drives. (Two 2.5" Solid State Drives or Hard Drives and/or One M.2 NGFF (2280) Solid State Drive) Note: If the primary 2.5" Drive was not installed from HP, you will need the primary 2.5" Drive bracket p/n 813796-001 and cable p/n 813795-001 for installation. The secondary 2.5" Drive bracket and connector part numbers are not available. (The M.2 slot supports SATA only Solid State Drives)