The Dell Inspiron 5501 Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2230) Solid State Drives) Note: Both M.2 slots support M.2 (2280) or (2230) Drives by moving the metal mounting bracket to accommodate the form factor. If only 1 M.2 Drive was shipped from Dell, you will need the M.2 mounting bracket p/n KYMC9 and mounting bracket screw p/n 49RK6 and M.2 drive screw p/n DF6CG to Install the second M.2 Drive. (Both M.2 slots support PCIe NVMe Solid State Drives)