The Asus Transformer Book T100TAR Laptop Supports Single and Dual Drive Configurations. (One eMMC Solid State Flash Drive in the Tablet and One 2.5" 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 revision.