Nuestras marcas

Web de Schneider Electric España

Bienvenido a nuestra web
        
¿Cómo podemos ayudarle hoy?
How do I activate/deactivate the EWF (Enhanced write filter) on Windows 7 Embedded?

Issue

File writes or program installation to the main drive of a Magelis iPC are not being kept before and after a restart because the disk volume is write-protected.

Magelis iPC, EWF, Write Protection, HMIG5U, HMIG5U2, Windows 7 Embedded, Disk Volume, Restart, Command Prompt, ewfmgr, Enable, Disable, Commit, GUI, Padlock Icon

Product LineMagelis iPC, HMIG5U, HMIG5U2

 

EnvironmentWindows 7 Embedded

Magelis iPC, EWF, Write Protection, HMIG5U, HMIG5U2, Windows 7 Embedded, Disk Volume, Restart, Command Prompt, ewfmgr, Enable, Disable, Commit, GUI, Padlock Icon

CauseThe main disk volume of the iPC is write-protected in order to maximize the life of the disk as well as ensuring the saved state of the disk for consistent behaviour day-to-day for applications which need it (for example a factory HMI). This is done through a feature called the Enhanced Write Filter (EWF).

 

ResolutionVerifying current state of EWF:

  1. Click on the** Start** button on your PC.
  2. Please now select the Run option and at the command prompt type** cmd** (make sure theres administrator rights..if not run as administrator)
  3. You will now be presented with a black command prompt window and within this will need to type – ewfmgr c:
  4. This will now return a series of results and will tell you the current state of the EWF.

 

The Windows Taskbar will also indicate the EWF status:

See the screenshot: "Windows Taskbar EWF State.png"

 

EWFMGR activate and deactivate commands to use:

To use any of the following commands then you will need to firstly navigate to the command prompt window with the following steps:

  1. Click on the Start button on your PC.
  2. Please now select the Run option and at the command prompt type cmd
  3. You will now be presented with a black command prompt window and begin typing the following commands:

ewfmgr.exe c: -Enable 

Activates the EWF from the DOS cmd prompt.

ewfmgr.exe c: -Disable

Deactivates the EWF from the DOS cmd prompt.

ewfmgr.exe c: -commitanddisable

Commits changes that exist in the RAM state to the drive, then deactivates the EWF from the DOS cmd prompt

 

The Graphical User Interface to Activate/Deactivate EWF can also be used (EWF Windows GUI.PNG):

1. Double-click on the padlock icon and the :Enhanced Write Filter: Overview” popup should appear.

2. Select the “C:” row.

3. Click on “Configure…”

4. Select “Disable”

5. Tick the “Commit” Checkbox

6. Click OK

7. Windows Restart windows from the Start bar.

-

Magelis iPC, EWF, Write Protection, HMIG5U, HMIG5U2, Windows 7 Embedded, Disk Volume, Restart, Command Prompt, ewfmgr, Enable, Disable, Commit, GUI, Padlock Icon

Schneider Electric España

Explorar más
Producto:
Explorar más
Producto:
Your browser is out of date and has known security issues.

It also may not display all features of this website or other websites.

Please upgrade your browser to access all of the features of this website.

Latest version for Google Chrome, Mozilla Firefox or Microsoft Edgeis recommended for optimal functionality.
Your browser is out of date and has known security issues.

It also may not display all features of this website or other websites.

Please upgrade your browser to access all of the features of this website.

Latest version for Google Chrome, Mozilla Firefox or Microsoft Edgeis recommended for optimal functionality.