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File Based Write Filter (Windows Embedded Standard 7)

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Unified Write Filter (UWF)

The Unified Write Filter (UWF) is the write filter in Windows 10 IoT.The UWF intercepts all I/O write attempts and forwards them to the overlay buffer. The overlay buffer is an area in the RAM. Thus, the programs running on the device do not access the flash memory of the device. In this way, the operating system is protected from changes. All changes are discarded when the system is rebooted.

The behavior of the UWF with regard to the overlay buffer can be configured in IGEL Setup.

You can find further information on the Unified Write Filter on this page at the Microsoft Developer Network.

UWF status display in the taskbar

Settings in IGEL Setup