The HP ProBook 430 G2 Notebook Comes in Different Storage Configurations and Supports Either 1 or 2 Drives Depending on the System Board Installed. (Single and Dual Drive Options with a 4th or 5th Gen Intel Core i3/i5/i7 Processor: One 2.5" Solid State Drive/Hard Drive and/or One M.2 NGFF (2242) Solid State Drive in the empty WWAN Slot) or (Single Drive Option with a Intel Pentium or Celeron Processor: One 2.5" Solid State Drive/Hard Drive) Note: Models with a Intel Pentium or Celeron Processor do not support a M.2 NGFF (2242) Drives in the WWAN slot. Models with a 4th or 5th Gen Intel Core i3/i5/i7 Processor do support a M.2 NGFF (2242) Solid State Drives in the WWAN slot. If the 2.5" Drive was not Installed from HP, you will need the 2.5" Drive hardware kit p/n 768201-001 (Includes: 2.5" Drive mounting bracket and screws) for installation.