The Dell XPS 15 9510 Laptop Supports Single and Dual Drive Configurations. (Two M.2 NGFF (2280) or (2230) Solid State Drives) Note: The M.2 (2280) Solid State Drive has a unique thermal bracket and cannot be interchanged with the (2230) Solid State Drive thermal bracket. The M.2 (2230) Drive uses a adapter bracket p/n 07HMH to accommodate for the larger M.2 (2280) slot. If installing a M.2 (2280) Drive in the primary slot 1 (SSD-1), you will need the M.2 (2280) Drive thermal bracket p/n 130R6 for installation. If installing a M.2 (2280) Drive in the secondary slot 2 (SSD-2), you will need the M.2 (2280) Drive thermal bracket p/n 4TW9C for installation. (Both M.2 slots support PCIe NVMe Solid State Drives)