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Unified Write Filter

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2 Unified Write Filter

2.1 Overview

Unified Write Filter (UWF) is a built-in optional feature provided in the Windows

Enterprise operating system. This section will go over a brief overview of some of the most

critical UWF aspects. For a more detailed and up-to-date overview, please refer to Microsoft

documentation at

https://docs.microsoft.com/en-us/windows-hardware/customize/enterprise/unified-

write-filter

2.2 Considerations

When enabling UWF, the operating system automatically disables:

– Paging files

– System restore

– Superfetch

– File indexing service

– Fast startup

– Defragmentation service

2.3 Overlay

To enable UWF protection on a system, a user must specify which volume to redirect to a

virtual overlay. UWF supports two locations where the overlay can be configured:

– RAM: All writes to a disk volume are redirected to system RAM. Since RAM is in limited

supply compared to disk space, an overlay configured on RAM will exhaust faster than

one configured on disk.

– DISK: All writes to a volume are redirected to a temporary location on a drive. This

temporary location is cleared on a system reboot.

2.3.1 Overlay limitations

There are limitations on which volumes can be protected by UWF.

– FAT, FAT32, and NTFS are the only file system formats supported. UWF will still protect

a volume with other file system formats, but a user will not be able to commit files to

physical media or create exclusions to the virtual overlay.

– Up to 16 terabytes may be protected by UWF.

It is recommended to test on one system with UWF protection enabled before deploying

to a set of systems. This testing ensures that the configuration does not consume the

overlay in an unreasonably short amount of time. See “Debugging excessive overlay

consumption” on page 15 for more information.

During initial startup, the Windows operating system may write system journal files before

UWF is protecting the volume. This means that during a limited time at start up, NTFS

formatted drives are not protected by UWF.

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