Frequently Asked Questions

How does the FBWF work on Windows 7 PA 8000 controls?
Last Updated a year ago

Windows 7 Embedded File Based Write Filter (FBWF)



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Writing to storage media may be unwanted in an embedded device like
the PA 8000 CNC control.
The FBWF redirects all writes targeted for protected volumes to a RAM
cache called an overlay.
The FBWF protects parts of the HDD/SSD from write access. Compared
to the former used EWF (Enchanced Write Filter) the FBWF is more
flexible. While the EWF is something like an “All or Nothing” option the
FBWF gives the user the opportunity to decide which volume or folder
will be protected.
The FBWF is an basic feature inside the Win7 embedded Standard OS
which is used in actual PA 8000 CNC controls.
To make changes to the default settings the user should be switched
from “PA8000” to “admin”.


In the lower right corner of the Windows 7 desktop of the PA 8000 control
there is a double arrow which once clicked on it shows some hidden functions.
One of these functions is the FBWF which is displayed as a small padlock.
Once clicked on the padlock the FBWF overview appears:


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The Overview dialog box shows up and displays information about the state of the write filter, for both
for the current session and for the session after the system is restarted. It also displays information
about the memory configuration and a list of protected volumes:


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The User Interface Window displays the filter- and the volume configuration. In this area details are displayed about the write filter state, such as if it is enabled or disabled, if cache compression and cache pre-allocation are enabled or disabled, the size of the cache threshold, and a list of protected volumes. It shows also the state at the moment and the state which will be set after reboot:


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On the User Interface Window there are also three buttons named Configuration, Exclusion
List, Cache Content:


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For more help about the FBWF click on:



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