Software Introduction
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PPC-1781
card is used) based on actual needs.
Using EWF can minimize the times of write access to CF card. This is very important,
because the write cycle of CF card is limited due to technical reasons. Therefore, it is
recommended to enable EWF when CF card is used.
Caution
Each partition only activates one write filter – otherwise data may be lost.
EWF is pre-installed in the SIMATIC IPC image.
Make sure only one write filter is used on one partition, otherwise data may be lost.
Note:
By default, Windows Embedded Standard 2009 disables EWF. After setup for the
operating system, data should be backed up before enabling EWF.
2. Set up EWF
EWFMGR.EXE program can be used to install, enable or disable EWF. Command
prompts can be used to call the program. The following functions are provided:
Function Command
Write protection driver C: Enable ewfmgr
c:-enable
Write protection driver C: Disable
(revised file accepted)
ewfmgr c:-commitanddisable
Acceptance of revised files on driver C:
ewfmgr c:-commit
Indicating information about EWF
driver program
ewfmgr c:
Indicating help
ewfmgr c:/h
