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HP mt40 Administrator Reference Guide - Page 15

Enhanced Write Filter, Using the Enhanced Write Filter command line utility - software

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The FBWF Status icon displays the following states: ● Red lock: FBWF is disabled. ● Green lock: FBWF is enabled. ● Yellow lock: FBWF state will change on next boot. If you are logged on as an administrator, you can change the status of FBWF by right-clicking the icon and selecting the desired FBWF state. NOTE: Because the fbwfmgr.exe utility and the FBWF status service execute separate code, status changes made by fbwfmgr.exe are not automatically reflected by the FBWF status icon. If you use the command line to modify the FBWF, right-click the icon to refresh the status icon display (click anywhere on the screen to close the context menu). The status icon display is refreshed automatically when you make modifications through the FBWF Control Panel utility. The FBWF utility always reflects the current status. Enhanced Write Filter The Enhanced Write Filter (EWF) provides a secure environment for your computer by protecting it from undesired flash memory writes (the operating system and functional software components reside in flash memory). The write filter also extends the life of the computer by preventing excessive flash write activity. Instead of allowing writes directly to the flash memory, it intercepts all flash writes and caches them. To save changes to system configuration settings, you must disable the write filter cache or perform the -commit command during the current boot session. Otherwise, the new settings will be lost when the computer is shut down or restarted. If you do not want to make permanent changes, you can enable the write filter. The write filter cache contents are not lost when you log off and on again (as the same or different user). You can disable the write filter cache after the new logon and still retain the changes. After you disable the write filter, all future writes during the current boot session are written to the flash with no further caching until the computer is restarted. You can also enable/disable the write filter by using the command line. NOTE: Only an account with administrator privileges can enable, disable, or commit the enhanced write filter. NOTE: Always enable the write filter after you have made all of your permanent changes. Using the Enhanced Write Filter command line utility CAUTION: When using the -commit command, all of the temporary contents are permanently written to the flash memory. NOTE: Because the Enhanced Write Filter commands are executed on the next boot, you must restart the computer for the command to take effect. Windows Embedded includes the EWF command line utility. This utility enables you to issue a set of commands to the EWF driver, report the status of each protected volume overlay, and report the format of the overall EWF configurations. Enhanced Write Filter 5

Section	Page
Welcome	11
Finding information	11
HP Write Filters	13
File-Based Write Filter	13
Using the File-Based Write Filter command line utility	13
Using the File-Based Write Filter configuration interface	14
Using the File-Based Write Filter status utility	14
Enhanced Write Filter	15
Using the Enhanced Write Filter command line utility	15
Using the Enhanced Write Filter configuration interface	16
Using the Enhanced Write Filter status utility	17
Configuration	18
Local drives	18
Drive Z	18
Drive C	18
Saving files	19
Mapping network drives	19
Roaming profiles	19
Applications	20
Remote Desktop Connection	20
HP Remote Graphics Software (RGS)	20
TeemTalk Terminal Emulation	20
HP Device Manager	20
Citrix XenApp Client	20
HP ThinState Capture	21
HP ThinState Deploy	21
Microsoft Internet Explorer	21
Windows Media Player	22
VMware View Manager	22
Keyboard and pointing devices	23
Using the keyboard	23
Identifying the hotkeys	23
Using pointing devices	25
Setting pointing device preferences	25
Using the TouchPad	25
Turn the TouchPad off and on	25
Navigating	26
Selecting	26
Power	27
Shutting down the computer	27
Setting power options	28
Using power-saving states	28
Initiating and exiting Sleep	28
Using the power meter	28
Using power plans	29
Viewing the current power plan	29
Selecting a different power plan	29
Customizing power plans	29
Setting password protection on wakeup	29
Using battery power	30
Displaying the remaining battery charge	30
Inserting or removing the battery	30
Maximizing battery discharge time	31
Managing low battery levels	31
Identifying low battery levels	31
Resolving a low battery level	32
Resolving a low battery level when external power is available	32
Resolving a low battery level when no power source is available	32
Conserving battery power	32
Storing a user-replaceable battery (select models only)	32
Disposing of a user-replaceable battery (select models only)	32
Using external AC power	33
Testing an AC adapter	34
Multimedia	35
Using multimedia	35
Using the audio features	35
Using the audio-in (microphone) jack	36
Using the audio-out (headphone) jack	36
Adjusting the volume	37
Using the video features	37
Using the external monitor port	37
DisplayPort	38
Wireless	39
About integrated wireless devices	39
Using wireless controls	39
Using the wireless button	39
Using operating system controls	39
Using WLAN	39
Setting up a WLAN	40
Connecting to a WLAN	41
Using wireless security features	41
Local area network (LAN)	43
Connecting to a local area network	43
Security	44
Protecting the computer	44
Using passwords	45
Setting passwords in Windows	45
Using administrator and user passwords	45
Automatic logon	45
Manual logon	46
Administrator logon	46
Setting passwords in Computer Setup	46
Using a setup password	46
Managing a setup password	47
Entering a setup password	47
Using a power-on password	47
Managing a power-on password	48
Entering a power-on password	48
Requiring a power-on password at restart	48
Installing a security cable	49
Connecting hardware	50
Using a USB device	50
Connecting a USB device	50
Securing USB ports	51
Using the USB Storage Options utility	51
Using Media Card Reader cards	52
Inserting a digital card	53
Removing a digital card	53
Using ExpressCards	54
Configuring an ExpressCard	54
Inserting an ExpressCard	55
Removing an ExpressCard	56
Hardware upgrades	57
Handling drives	57
Removing or replacing the service door	58
Removing the service door	58
Replacing the service door	59
Replacing the hard drive	60
Removing the hard drive	60
Installing a hard drive	61
Replacing a drive in the upgrade bay	62
Replacing an optical drive	62
Replacing memory modules	63
Using optical drives (select models only)	65
Inserting an optical disc (CD or DVD)	66
Removing an optical disc (CD or DVD)	67
When the disc tray opens	67
When the disc tray does not open	68
Using external drives	69
Using optional external devices	69
Computer Setup (BIOS) and Advanced System Diagnostics	70
Using Computer Setup	70
Starting Computer Setup	70
Navigating and selecting in Computer Setup	70
Restoring factory settings in Computer Setup	71
Updating the BIOS	72
Downloading SoftPaqs to update the BIOS	72
BIOS Setup Menu	72
Main menu	72
Security menu	72
Diagnostics menu	72
Using Advanced System Diagnostics	73
Routine care	74
Cleaning your computer	74
Cleaning products	74
Cleaning procedures	74
Cleaning the display	74
Cleaning the sides and cover	75
Cleaning the TouchPad and keyboard	75
Traveling with the computer	75
Troubleshooting	77
Quick troubleshooting	77
The computer is unable to start up	77
The computer screen is blank	78
The computer is on but is not responding	78
The computer is unusually warm	79
The wireless network connection is not working	79
Some external devices are not working	79

Match case Limit results 1 per page

The FBWF Status icon displays the following states:

●

Red lock: FBWF is disabled.

●

Green lock: FBWF is enabled.

●

Yellow lock: FBWF state will change on next boot.

If you are logged on as an administrator, you can change the status of FBWF by right-clicking the

icon and selecting the desired FBWF state.

NOTE:

Because the fbwfmgr.exe utility and the FBWF status service execute separate code, status

changes made by fbwfmgr.exe are not automatically reflected by the FBWF status icon.

If you use the command line to modify the FBWF, right-click the icon to refresh the status icon display

(click anywhere on the screen to close the context menu). The status icon display is refreshed

automatically when you make modifications through the FBWF Control Panel utility. The FBWF utility

always reflects the current status.

Enhanced Write Filter

The Enhanced Write Filter (EWF) provides a secure environment for your computer by protecting it

from undesired flash memory writes (the operating system and functional software components

reside in flash memory). The write filter also extends the life of the computer by preventing excessive

flash write activity. Instead of allowing writes directly to the flash memory, it intercepts all flash writes

and caches them.

To save changes to system configuration settings, you must disable the write filter cache or perform

the

-commit

command during the current boot session. Otherwise, the new settings will be lost when

the computer is shut down or restarted. If you do not want to make permanent changes, you can

enable the write filter.

The write filter cache contents are not lost when you log off and on again (as the same or different

user). You can disable the write filter cache after the new logon and still retain the changes.

After you disable the write filter, all future writes during the current boot session are written to the

flash with no further caching until the computer is restarted. You can also enable/disable the write

filter by using the command line.

NOTE:

Only an account with administrator privileges can enable, disable, or commit the enhanced

write filter.

NOTE:

Always enable the write filter after you have made all of your permanent changes.

Using the Enhanced Write Filter command line utility

CAUTION:

When using the

-commit

command, all of the temporary contents are permanently

written to the flash memory.

NOTE:

Because the Enhanced Write Filter commands are executed on the next boot, you must

restart the computer for the command to take effect.

Windows Embedded includes the EWF command line utility. This utility enables you to issue a set of

commands to the EWF driver, report the status of each protected volume overlay, and report the

format of the overall EWF configurations.

Enhanced Write Filter