The Asus ExpertBook P3 P3540FB Laptop Supports Single and Dual Drive Configurations. (One 2.5" Solid State Drive or Hard Drive and/or One M.2 NGFF (2280) Solid State Drive) Note: If the 2.5" Drive was not installed from Asus, you will need the 2.5" Drive support bracket right p/n 13NX0260M06011 and support bracket left p/n 13NX0260M07011 and mylar cover p/n 13NX01A0L13011 and connector cable p/n 14010-00218800 for installation. (The M.2 slot supports SATA and PCIe NVMe Solid State Drives)