Windows Embedded Standard 7 for HP Thin Clients - Administrator Guide
EWF and FBWF management overview
There are three tools you can use to manage EWF and FBWF: a notication icon, a Control Panel app, and a
command-line tool. Some commands can be performed using any of the tools, but other commands might be
exclusive to one or two of the tools.
Notication icon
The notication icon for EWF and FBWF is located in the Windows notication area. The following commands
can be executed by right-clicking the notication icon and selecting the desired option:
● Enable—Enables the specied write lter (requires a system restart)
● Disable—Disables the specied write lter (requires a system restart)
● Commit (EWF only)—Commits the entire overlay cache (requires a system restart)
● Clear Command—Clears the previously-set boot command (such as Enable or Disable)
NOTE: You cannot disable one write lter and enable the other write lter in a single boot command using
the notication icon. To perform this action, use the HP Write Filter Conguration tool or the command line.
The following table describes the possible states of the notication icon for EWF and FBWF.
Icon EWF FBWF Description
√ √ Either EWF or FBWF is enabled, and no boot command is set.
√ √ One or more boot commands have been set, and the required system restart will result in one of
the following:
● The write lter in use will be disabled.
● The write lter in use will be disabled, and the other write lter will be enabled.
● The entire overlay cache will be committed (EWF only).
√ √ Both EWF and FBWF are disabled, and no boot command is set.
√ √ Either EWF or FBWF will be enabled (requires a system restart).
√ The memory usage of the FBWF overlay cache has reached a warning level.
√ The memory usage of the FBWF overlay cache has reached a warning level, one or more boot
commands have been set, and the required system restart will result in one of the following:
● FBWF will be disabled.
● FBWF will be disabled and EWF will be enabled.
√ The memory usage of the FBWF overlay cache has reached a critical level.
√ The memory usage of the FBWF overlay cache has reached a critical level, one or more boot
commands have been set, and the required system restart will result in one of the following:
● FBWF will be disabled.
● FBWF will be disabled and EWF will be enabled.
√ √ The write lter in use is corrupted.
14 Appendix A Enhanced Write Filter and File-Based Write Filter