The HP x2 210 G1 Tablet Supports Single and Dual Drive Configurations. (One eMMC Flash Drive in the Tablet + One 2.5" Solid State Drive or Hard Drive in the Keyboard Dock on select models) Note: The eMMC Flash Drive in the Tablet is integrated on the system board and is not upgradable. The 2.5" Drive is only supported in the keyboard dock on select models depending on the base enclosure, hinge cover and top cover with keyboard. If your model has the correct keyboard dock, you will need the 2.5" Drive bracket hardware kit p/n 833637-001 for installation in the keyboard dock.