The HP ProBook 445 G9 Notebook Supports Either 1 or 2 Drives Depending on the WWAN Card Installed. Dual Drive Options with no WWAN Card Installed: (One M.2 NGFF (2280 or 2230) Solid State Drive in Primary Slot and/or One M.2 NGFF (2230) Solid State Drive in the empty WWAN Slot) Single Drive Configuration with WWAN Card Installed: (One M.2 NGFF (2280 or 2230) Solid State Drive in Primary Slot) Note: The primary M.2 slot supports M.2 (2280) and (2230) Drives by moving the support screw to accommodate the M.2 Drive form factor. The secondary M.2 slot supports M.2 (2230) Drives and can only be installed if the WWAN card is not installed. (Both M.2 slots support PCIe NVMe Solid State Drives)