Moxa V2406-LX [23/41] Enhanced write filter

V2406/2422/2426 Series Software Configuration

2-10

Enhanced Write Filter

The “Enhanced Write Filter” protects the contents of a volume on the target media volume by redirecting all

writes to another storage location called on overlay. Use the following steps to enable the Enhanced Write

Filter.

1. Type EWFMGR C: to check if the state of the Enhanced Write Filter is Disabled.

2. To enable the filter, type EWFMGR C: -enable.

3. Reboot the system to activate the change.

4. Delete a file on your protected volume and reboot the system; the file you just deleted will appear.

File Based Write Filter

File-Based Write Filter (FBWF) allows Windows Embedded Standard 2009 to maintain the appearance of read

and write access to write sensitive or read only storage. FBWF makes read and write access transparent to

applications.

Writing to storage media may be undesirable or impossible in embedded devices. FBWF redirects all writes

targeted for protected volumes to a RAM cache called an overlay. In this context, an overlay can be likened to

a transparency overlay on an overhead projector. Any change made to the overlay affects the picture as seen

in the aggregate, but if the overlay is removed, the underlying picture remains unchanged.

Follow the steps below to enable FBWF:

1. In the command prompt, type fbwfmgr /displayconfig to check the current FBWF status. The status

defaults to disabled.

C:\>fbwfmgr /displayconfig

File-based write filter configuration for the current session:

Filter state: disabled.

File-based write filter configuration for the next session:

Filter state: disabled.

C:\>

2. Type fbwfmgr /enable to enable FBWF. Reboot the system for the changes to come into effect.

C:\>fbwfmgr /enable

File-based write filter will be enabled on the next reboot.

C:\>