Configure FBWF at Design Time (Standard 8)

7/8/2014

Learn how to configure File-Based Write Filter (FBWF) at design time on your Windows Embedded 8 Standard (Standard 8) image.

When you use DISM to deploy FBWF, you must configure features that are ordinarily disabled by the FBWF installer.

To configure FBWF in DISM

Disable disk defragmentation by adding the following registry key to your run-time image:
- Disable Background disk defragmentation:
- Key Name: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\defragsvc
- Name: Start
- Type: REG_DWORD
- Value: 4
(Optional) Change the BootStatusPolicy setting to IgnoreAllFailures by using BCDEdit. This setting is not critical to FBWF operation. You can apply the setting using the following command:
```
bcdedit.exe /set {bootloadersettings} BOOTSTATUSPOLICY IgnoreAllFailures
```
(Optional) Set the FBWF cache threshold size. If you do not supply a value, the driver will assume defaults. You may apply this setting using the FBWF APIs or Fbwfmgr.exe (For example, fbwfmgr /setthreshold 128).

If not specified, the value will default to 128 MB for 32-bit systems and 256 MB for 64-bit systems. Valid MB ranges are 16 to 1024 for 32-bit systems and 16 to 131072 for 64-bit systems.

To improve performance, you can change the following settings: