The Dell Inspiron 15 3000 (3530) Laptop with USB Type-C Supports Either 1 or 2 Drives Depending on the Battery Installed. (One 2.5" Solid State Drive or Hard Drive with the Smaller 3-cell 41Whr Battery Installed and/or One M.2 NGFF (2280) Solid State Drive) or (One M.2 NGFF (2280) Solid State Drive with the Larger 4-cell 54Whr Battery Installed) Note: Models that have the larger 4-cell 54Whr battery installed do not support 2.5" Drives due to the larger battery occupying the 2.5" Drive bay. If the 2.5" Drive was not installed from Dell on models with the smaller 41Whr battery, you will need the 2.5" Drive caddy p/n VRFHK and cable p/n JW93P for installation. (The Dell Inspiron 15 3000 (3530) Laptop with USB Type-C supports PCIe NVMe Gen4.0 x4 and Gen3.0 x4 Solid State Drives)