Contec XPT-T1000 Series, Manual

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Notes Regarding Use
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XPT-T1000 Manual for OS Pre-installed Type (Windows 10 IoT Enterprise 2019 LTSC)
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4. About Unified Write Filter
Unified Write Filter function (referred to as “UWF” in this document) is the new filtering which
combined EWF, FBWF, and Registry filter.
UWF has deterred the write to DISK by redirecting the write to DISK from operating system or
application to overlay.
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If you are updating software, adding data, or changing the settings, make sure to disable the
UWF filter settings before doing so.
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Even if shut down, the contents written to the memory will not be written back to the disk.
They will be deleted if you shut down or restart the system.
UWF of preinstalled type is not suitable for all configurations.
In particular, it is unsuitable for "the configuration which a lot of write requests generate from
operating system or application to protected DISK." Under such an environment, restarting Windows
is frequently needed.
The following describes a limitation for the specification of the UWF function in Windows 10 IoT
Enterprise 2019 LTSC. Understand it completely for implementation.
CAUTION
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Removable media (USB memory etc.) cannot be set as the UWF candidate.
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Folders or files that are excluded from protection cannot be moved into the protection area.
If a "Recycle Bin" is an object for protection, it becomes as a deleting error since Explorer once
moves the file to "Recycle Bin". In this case, delete the object without going through "Recycle
Bin" by using Shift+Del keys on the keyboard.
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The function of File Exclusion and Registry Exclusion are available only in a FAT/NTFS volume.
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Volumes, such as exFAT, can be protected by UWF. However, the function of protect exclusion
cannot be used.
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UWF supports NTFS. However, since the journal file of NTFS is recorded until a services of UWF
begins, writing to DISK occurs upon starting up.
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UWF cannot protect a Hidden partition.
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If UWF is set to Enabled and starts up, some functions in Windows are changed for the
performance improvement of UWF.
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Check the technical information for details from the link listed below.
Please refer to the Microsoft technical information for details about UWF.
https://msdn.microsoft.com/ja-jp/library/windows/hardware/mt572001(v=vs.85).aspx
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In early stages, a UWF overlay region serves as maximum size of 1024 MB.
The present operating condition of a UWF overlay region can be checked by the following
command.
>uwfmgr.exe overlay get-consumption
Systems operation is required so that a UWF overlay region may not be used to maximum size.