Unified Write Filter - Omron NY Series Operating Manual

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Unified Write Filter

The Unified Write Filter (UWF) is applicable to IPCs with a Windows 10 operating system.
The UWF intercepts disk changes and stores them into a memory overlay in RAM memory instead of
applying them to the original volume.
Additional Information
• Refer to Advantages of the Unified Write Filter on page A-5 for details.
• Refer to Considerations for the Unified Write Filter on page A-5 for details.
• Refer to the Microsoft Developer Network (MSDN) for details.
Advantages of the Unified Write Filter
Advantages of the Unified Write Filter.
The Unified Write Filter (UWF) provides the following benefits:
• Write-protect one or more partitions on a system.
• Make it possible to revert changes and revert to the original disk content.
• Enable booting from read-only media.
By redirecting all write requests to RAM the run-time image maintains the appearance of a writable
run-time image.
• Improve the file system performance when using relatively slow storage.
• Minimize write actions to the disk.
For example, minimize write access to flash memory. Write cycles on flash memory are limited for
technical reasons.
Considerations for the Unified Write Filter
Considerations for the Unified Write Filter (UWF).
When using the Unified Write Filter (UWF) all disk changes are stored into a memory overlay in RAM
memory instead of applying them to the original volume. This also applies to the installation of soft-
ware or changing parameters. For software changes, like Windows updates or system parameter
changes, it is required to disable the UWF, install the software and then enable the UWF again.
Using the UWF also consider following issues:
• To prevent data loss in the event of a power failure, the use of a UPS is recommended.
• When the UWF function is enabled and a large amount of data is written, the system memory space
will be reduced and operation may become unstable. To prevent this problem, it is recommended
that a large amount of data be written to a different location.
• Automatic Adjustment of daylight saving time (DST) is incompatible with the UWF enabled.
Configuration of the Unified Write Filter
The Unified Write Filter (UWF) is included in the Windows 10 image.
The UWF is default disabled for an Industrial PC.
The configuration of this component can be defined with the command line tool
NY-series Industrial PC Operating Systems and Software Utilities Manual (W616)
Appendices
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uwfmgr.EXE
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