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Unified Write Filter (Industry 8.1)

  • Article

7/8/2014

You can use Unified Write Filter (UWF) to protect your storage media. UWF intercepts all write attempts to a protected volume and redirects those write attempts to a virtual overlay. This improves the reliability and stability of your device and reduces the wear on write-sensitive media, such as flash memory media like solid state drives.

Important

UWF is not configurable in Embedded Lockdown Manager (ELM) when it is disabled. You must enable UWF before configuring it with ELM.

For more information about UWF on Industry 8.1, see Unified Write Filter (Industry 8.1) on MSDN.

For more information about UWF on Standard 8, see Unified Write Filter (UWF) Overview (Standard 8) on MSDN.

Actions

On this window in ELM, you can use the following commands:

  • Export to PowerShell
    Creates a Windows PowerShell script that you can use to apply the current UWF configuration to any device running Industry 8.1 or Standard 8.
  • Enable/Disable Unified Write Filter
    Enables or disables UWF after the next restart.
  • Enable/Disable HORM
    Enables or disables Hibernate Once/Resume Many (HORM) after the next restart. You cannot enable HORM if you have defined any file or registry exclusions.
  • Edit overlay properties
    Opens the Overlay Properties dialog box in which you can change the maximum overlay size and the overlay storage mode.

Overlay Properties

In this dialog box, you can set the following properties of the overlay:

  • Overlay Size
    Defines the maximum size, in MB, of the overlay.

  • Overlay Storage
    Defines where the overlay is stored. The following table shows the possible values.

    Value

    Description

    Disk Only

    Stores the overlay in a file on disk.

    Memory (RAM)

    Stores the overlay entirely in RAM.

    The overlay does not persist across restarts, even if stored on disk.

    To make the either of the following property changes, you must first disable UWF and restart the device:

    • If Overlay Storage is set to Disk Only and you want to change the value in Overlay Size.
    • If you want to change the Overlay Storage type.

See Also

Concepts

Embedded Lockdown Manager