HP MP6 Quick Reference Guide HP Digital Signage Player MP6 and MP4 Microsoft&a - Page 25

DOS command-line tool boot commands, Using boot commands, File-Based Write Filter Manager

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DOS command-line tool boot commands The following table lists the EWF boot commands that are supported. Boot Command Description All Displays information about all protected volumes and performs a command, such as Disable, Enable, and Commit, on each volume if specified. Commit Commits all current level data in the overlay to the protected volume and resets the current overlay level to 1 upon shutdown. Disable Allows user to write to the image after the next reboot. Enable Prevents the user from writing to the image after the next reboot. Commitanddisable Combination of the Commit and Disable commands. This command will commit data in the overlay upon shutdown. Additionally, EWF will be disabled after the system reboots. NOTE: When using the Commit boot command, all the temporary contents will be permanently written to the flash memory or hard disk. In addition, all content accessed (and changes made) after running Commit, but before rebooting the system, will be written as well. This includes changes made during any number of login/logout sessions before the next reboot. Using boot commands To use the EWF manager boot commands, type the following syntax in a command prompt: EWFMGR -[boot command]. NOTE: Because the EWF manager commands are executed on the next boot, you must reboot the system for the command to take effect. File-Based Write Filter Manager WES includes the File-Based Write Filter (FBWF) console application command-line tool, fbwfmgr.exe. In addition to the DOS command-line tool, the WES image includes a write filter GUI. Benefits of the File-Based Write Filter The FBWF provides a secure environment for digital signage player computing. It does this by protecting the digital signage player from undesired writes. For the MP4 model, the write filter also extends the life of the digital signage player by preventing excessive flash write activity. It maintains the appearance of read and write access to write-sensitive or read-only storage to the operating system, making read and write access transparent to applications. File and/or folder exclusions can be configured to allow certain changes to persist, while preventing others from writing to disk. Write filters 19

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DOS command-line tool boot commands
The following table lists the EWF boot commands that are supported.
Boot Command
Description
All
Displays information about all protected volumes and performs a command, such as
Disable
,
Enable
,
and
Commit
, on each volume if specified.
Commit
Commits all current level data in the overlay to the protected volume and resets the current overlay
level to 1 upon shutdown.
Disable
Allows user to write to the image after the next reboot.
Enable
Prevents the user from writing to the image after the next reboot.
Commitanddisable
Combination of the
Commit
and
Disable
commands. This command will commit data in the overlay
upon shutdown. Additionally, EWF will be disabled after the system reboots.
NOTE:
When using the Commit boot command, all the temporary contents will be permanently
written to the flash memory or hard disk. In addition, all content accessed (and changes made) after
running Commit, but before rebooting the system, will be written as well. This includes changes made
during any number of login/logout sessions before the next reboot.
Using boot commands
To use the EWF manager boot commands, type the following syntax in a command prompt:
EWFMGR <drive-letter> —[boot command]
.
NOTE:
Because the EWF manager commands are executed on the next boot, you must reboot the
system for the command to take effect.
File-Based Write Filter Manager
WES includes the File-Based Write Filter (FBWF) console application command-line tool,
fbwfmgr.exe. In addition to the DOS command-line tool, the WES image includes a write filter GUI.
Benefits of the File-Based Write Filter
The FBWF provides a secure environment for digital signage player computing. It does this by
protecting the digital signage player from undesired writes. For the MP4 model, the write filter also
extends the life of the digital signage player by preventing excessive flash write activity. It maintains
the appearance of read and write access to write-sensitive or read-only storage to the operating
system, making read and write access transparent to applications. File and/or folder exclusions can
be configured to allow certain changes to persist, while preventing others from writing to disk.
Write filters
19