Compaq 6720t HP 6720t Mobile Thin Client Administrator Reference Guide - Windo - Page 21

Using the Enhanced Write Filter (EWF) utility, Using the Enhanced Write Filter (EWF) status utility

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Using the Enhanced Write Filter (EWF) utility In addition to the DOS command-line tool, Windows Embedded includes an EWF utility. You can access the EWF utility through the Windows Control Panel or through the Administrative Tools option for the administrator. To access the EWF utility using Administrative Tools, follow these steps: 1. Log on as an administrator. 2. Select Start > Control Panel > Performance and Maintenance > Administrative Tools. 3. Click the EWF Manager icon. 4. Use the EWF utility to select Write Filter options. The EWF utility includes the following buttons: ● Enable EWF Enables the Enhanced Write Filter so that data written to the protected media is cached in the overlays. The current overlay level becomes 1 as soon as EWF is started, and a new overlay is created at level 1. ● Disable EWF Disables the overlay on the specified protected volume. ● Overlay configuration Displays the overlay information and is a combination of the information supplied when executing ewfmgr.exe c: -description and ewfmgr.exe c: -gauge from the DOS prompt. ● Clear boot command Clears the boot command from the DOS prompt. ● Commit data to volume Commits all current-level data in the overlay to the protected volume, and resets the current overlay value to 1. Using the Enhanced Write Filter (EWF) status utility The EWF status utility creates an icon in the notification area at the far right of the taskbar that shows the status of the EWF. You can right-click on the icon to display and execute the available options. The EWF Status icon displays the following states: ● Red lock: EWF is disabled. ● Green lock: EWF is enabled. ● Yellow lock: EWF state will change on next boot. If you are logged on as an administrator, you can change the status of EWF by right-clicking the icon and selecting the desired EWF state. Using the Enhanced Write Filter (EWF) utility 11

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Using the Enhanced Write Filter (EWF) utility
In addition to the DOS command-line tool, Windows Embedded includes an EWF utility. You can access
the EWF utility through the Windows Control Panel or through the Administrative Tools option for the
administrator.
To access the EWF utility using Administrative Tools, follow these steps:
1.
Log on as an administrator.
2.
Select
Start
>
Control Panel
>
Performance and Maintenance
>
Administrative Tools
.
3.
Click the
EWF Manager
icon.
4.
Use the EWF utility to select Write Filter options.
The EWF utility includes the following buttons:
●
Enable EWF
Enables the Enhanced Write Filter so that data written to the protected media is cached in the
overlays. The current overlay level becomes 1 as soon as EWF is started, and a new overlay is
created at level 1.
●
Disable EWF
Disables the overlay on the specified protected volume.
●
Overlay configuration
Displays the overlay information and is a combination of the information supplied when executing
ewfmgr.exe c: -description and ewfmgr.exe c: -gauge from the DOS prompt.
●
Clear boot command
Clears the boot command from the DOS prompt.
●
Commit data to volume
Commits all current-level data in the overlay to the protected volume, and resets the current overlay
value to 1.
Using the Enhanced Write Filter (EWF) status utility
The EWF status utility creates an icon in the notification area at the far right of the taskbar that shows
the status of the EWF. You can right-click on the icon to display and execute the available options.
The EWF Status icon displays the following states:
●
Red lock: EWF is disabled.
●
Green lock: EWF is enabled.
●
Yellow lock: EWF state will change on next boot.
If you are logged on as an administrator, you can change the status of EWF by right-clicking the icon
and selecting the desired EWF state.
Using the Enhanced Write Filter (EWF) utility
11