A-6-2 File-Based Write Filter - Omron NY532-1500 Setup And User's Manual

Command
ewfmgr /h
Considerations
• EWF and FBWF cannot be used simultaneously.
• To prevent data loss in the event of a power failure, the use of a UPS is recommended.
• When the EWF 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 Enhanced Write Filter
(EWF).
Additional Information
Refer to the Microsoft Developer Network (MSDN) for DST details.
A-6-2
File-Based Write Filter
File-Based Write Filter (FBWF) intercepts file changes and stores them into a memory overlay in RAM
memory instead of applying them to the original volume.
When FBWF is enabled, all files and folders of a partition are protected unless they are included in an
exception list.
Additional Information
• Enhanced Write Filter (EWF) provides a similar function, but operates at the sector level,
while FBWF operates at the file level. FBWF is more flexible in its configuration than EWF
and allows immediate writing without rebooting.
• Refer to the Microsoft Developer Network (MSDN) for detailed information.
Application
EWF and FBWF provide 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, EWF and FBWF enable the run-time image to maintain 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.
NY-series Industrial Panel PC / Industrial Box PC Setup User's Manual (W568)
Function
Displays a helpscreen that explains all com-
mands and options available.
Appendices
Remarks
A complete reference can be found at the
Microsoft Developer Network (MSDN).
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