Moxa DA-683-DPP-T-W7E [12/35] File based write filter

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.

Configuring File-Based Write Filter

Follow these steps to enable the Enhanced Write Filter. Keep in mind that, while FBWF and EWF may both be

enabled on the same machine; FBWF can not protect a volume also protected by EWF. Similarly, EWF can not

protect a volume also protected by FBWF.