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Configure EWF RAM Mode (Standard 8)

  • Article

7/8/2014

Learn how to configure Enhanced Write Filter (EWF) RAM mode on your Windows Embedded 8 Standard (Standard 8) device.

Enhanced Write Filter (EWF) RAM mode stores overlay data in system memory. Because the overlay is stored in RAM, your device may require additional RAM, depending on how many write operations are made to the system. In addition, because the data cache is stored in volatile memory, the data cache is lost when the system restarts.

To configure EWF RAM mode

  1. Create a working configuration by using Image Configuration Editor (ICE).

  2. Add the Enhanced Write Filter module to your configuration.

  3. On the Validate menu, click Add Required Modules.

  4. Resolve any errors listed in the Messages pane.

  5. In the Configuration File pane, expand the Lockdown node, and then select Enhanced Write Filter. The EWF configuration settings appear in the Settings pane.

  6. Change the following default settings for the Enhanced Write Filter module:

    1. In the Filter view by box, select 4 Specialize.
    2. In the EWFMode box, select Ram.
    3. Right-click the ProtectedVolumes setting, and then click Insert New Volume.
    4. Expand the Volume node.
    5. Set the Key value to any unique number.
    6. For the DiskNumber property, type the disk number that contains the volume that you want to protect.
    7. For the PartitionNumber property, type the partition number for the volume that you want to protect.

    Important

    If you do not specify any volumes in the ProtectedVolumes setting, the EWF configuration defaults to EWF RAM Reg mode.

    Note

    You can protect multiple volumes by adding additional volumes to the EWF configuration.

  7. Save the configuration file.

  8. Make sure that there is additional space on the media where you plan to deploy your run-time image. During the EWF installer phase, EWF creates the EWF volume on the media that will contain metadata information about the EWF configuration.

    The media that you deploy to cannot have more than three partitions and must support partitioning.

    Warning

    The Standard 8 setup process performs several verifications, which rely on the target device's date and time settings. For optimal performance, confirm that the target device is set to the correct date and time.

  9. Deploy the run-time image and start the device.

  10. After the install process is complete, verify the status of EWF by typing the following command line.

    ewfmgr -all

    By default, EWF should report that it is disabled on all drives.

  11. Enable EWF by typing the following command line:

    ewfmgr c: -enable

  12. Restart the system.

  13. Verify that EWF is correctly configured by typing the following command at a command prompt:

    ewfmgr c:

    Ewfmgr.exe should report that EWF is enabled and provide the status of the EWF RAM overlay.

See Also

Concepts

EWF Installation and Configuration
EWF Modes
Troubleshooting EWF
EWF Performance Considerations