Windows 10 Overlay for Unified Write Filter (UWF) This entry is to document my experience with the Windows 10 feature Unified Write Filter (UWF); with the intention to replace DeepFreeze on shared computers. "Unified Write Filter (UWF) protects the contents of a volume by redirecting all write operations on that volume to the overlay, which is a virtual representation of the changes to the volume. Conceptually, an overlay is similar to a transparency overlay on an overhead projector. Any change that is made to the transparency overlay affects the projected picture as it is seen by the viewer. However, if the transparency overlay is removed, the underlying picture remains unchanged. In a UWF protected system, UWF creates a single overlay, which contains information about writes to all protected volumes on a system. The overlay supports up to 16 terabytes of protected volumes." (extract from https://docs.microsoft.com/en-us/windows-hardware/customize/enterprise/uwfoverlay ) H