Moxa DA-685-W7E [12/38] File based write filter

DA-685 / W7E Enabling Windows 7 Write Protections

3-5

3. Once the EWF control dialog is open, select the drive

you wish to operate from the upper window of the

dialog, and then click on the Pending Command

drop-down menu just beneath. Here, you will see four

choices:

 No Command

 Disable: This disables EWF on the selected drive.

Be aware that the system will automatically reboot if

you select this command.

 Commit: This writes all current changes to the

system data to the hard drive; any changes that

have been made to the system settings.

 Commit and Disable Live: This writes all current

data and changes to the system, and also turns off

EWF on the selected drive (so that all future data

and system changes will also be committed to the

drive, as well). Selecting this option will NOT

automatically reboot your system.

For more detailed descriptions of these commands, please refer to the Microsoft website shown below:

http://msdn.microsoft.com/en-us/library/ff794092(v=winembedded.60).aspx

File-Based Write Filter

Overview

This section describes how to use the File-Based Writer Filter (FBWF). Please note that when Enhance Writer

Filter is enabled, the File-Based Writer Filter function will not work.

According to Microsoft:

File-Based Write Filter (FBWF) allows the Windows Embedded platform to maintain the

appearance of read and write access on 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. Used

in this context, an overlay is similar 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.

FBWF provides the advanced feature than EWF to let user specify the directory to write the data to disk drive

directly, in our default setting, the default directory is under c:\temp, which means you can read/write the data

into disk without commit action.

To get more details about EWF configuration and usage, you may consult the Micrsoft help file that comes with

your computer, or:

Go to Microsoft’s FBWF Installation and Configuration help pages.

Go to Microsoft’s FBWF overview on the official Microsoft FBWF help pages.

Go to Microsoft’s detailed description of FBWF features on the FBWF help pages.

Go to Microsoft’s detailed description of the FBWF API.