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HP 4320t HP 4320t Mobile Thin Client Administrator Reference Guide - Page 23

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

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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. By including the EWF configuration interface in your configuration and building it into your image, you enable use of the EWF command line utility and the corresponding commands. To use the EWF command line utility, follow these steps: 1. Select Start > Run. 2. Type CMD in the Open field to access the system DOS prompt. 3. Click OK. 4. Type ewfmgr c: at the prompt. 5. Press enter. Enhanced Write Filter 13

Section	Page
Notebook tour	11
Identifying the hardware	11
Display	11
Top	12
Pointing devices	12
Lights	13
Buttons, switches, and speakers	14
Keys	15
Front	16
Right side	17
Left side	17
Bottom	18
Wireless antennas	18
Identifying the labels	19
HP Write Filters	21
File-Based Write Filter	21
Using the File-Based Write Filter command line utility	21
Using the File-Based Write Filter configuration interface	22
Using the File-Based Write Filter status utility	22
Enhanced Write Filter	23
Using the Enhanced Write Filter command line utility	23
Using the Enhanced Write Filter configuration interface	24
Using the Enhanced Write Filter status utility	25
Configuration	26
Local drives	26
Drive Z	26
Drive C	26
Saving files	26
Mapping network drives	27
Roaming profiles	27
User accounts	27
Creating a new user account	27
Creating user profiles	27
Applications	29
Remote Desktop Connection	29
HP Remote Graphics Software (RGS)	29
TeemTalk Terminal Emulation	29
HP Device Manager	29
HP Client Automation	29
HP ThinState Capture	30
HP ThinState Deploy	30
Microsoft Internet Explorer	30
Windows Media Player	30
Pointing devices and keyboard	31
Using pointing devices	31
Setting pointing device preferences	31
Connecting an external mouse	31
Using the keyboard	31
Using hotkeys	31
Displaying system information	32
Decreasing screen brightness	32
Increasing screen brightness	32
Switching the screen image	32
Muting speaker sound	33
Decreasing speaker sound	33
Increasing speaker sound	33
Playing the previous track or section of an audio CD or a DVD	33
Playing, pausing, or resuming an audio CD or a DVD	33
Playing the next track or section of an audio CD or a DVD	33
Using the keypads	33
Using the embedded numeric keypad	34
Enabling and disabling the embedded numeric keypad	34
Switching key functions on the embedded numeric keypad	35
Using an optional external numeric keypad	35
Power	36
Power control and light locations	36
Shutting down the computer	37
Setting power options	37
Using power-saving states	37
Initiating and exiting Sleep	37
Using the Power Meter	38
Using battery power	38
Displaying the remaining battery charge	38
Inserting or removing the battery	38
Charging a battery	39
Managing low battery levels	40
Identifying low battery levels	40
Resolving a low battery level	40
Resolving a low battery level when external power is available	41
Resolving a low battery level when a charged battery is available	41
Resolving a low battery level when no power source is available	41
Conserving battery power	41
Storing a battery	41
Disposing of a used battery	41
Using external AC power	42
Connecting the AC adapter	42
Multimedia	44
Using multimedia hardware	44
Using the audio features	44
Using the audio-in (microphone) jack	45
Using the audio-out (headphone) jack	45
Adjusting the volume	45
Using the video features	45
Using the external monitor port	45
Using the HDMI port	46
Using multimedia software	47
Opening preinstalled multimedia software	47
Using multimedia software	47
Preventing playback disruptions	48
Wireless	49
About integrated wireless devices	49
Using wireless controls	49
Using the wireless button	49
Using operating system controls	49
Using WLAN	49
Setting up a WLAN	50
Connecting to a WLAN	50
Using wireless security features	51
Identifying a WLAN device	51
Modem and LAN	52
Using a modem	52
Connecting a modem cable	52
Connecting a country- or region-specific modem cable adapter	53
Selecting a location setting	54
Viewing the current location selection	54
Adding new locations when traveling	54
Solving travel connection problems	54
Connecting to a local area network	56
Security	57
Protecting the computer	57
Using passwords	58
Setting passwords in Windows	58
Using administrator and user passwords	58
Automatic logon	58
Manual logon	59
Administrator logon	59
Setting passwords in Computer Setup	59
Using a setup password	59
Managing a setup password	60
Entering a setup password	60
Using a power-on password	60
Managing a power-on password	60
Entering a power-on password	61
Requiring a power-on password at restart	61
Installing a security cable	61
Connecting hardware	63
Using a USB device	63
Connecting a USB device	63
Securing USB ports	63
Using the USB Storage Options utility	64
Using Media Card Reader cards	65
Inserting a digital card	65
Removing a digital card	66
Using ExpressCards	67
Configuring an ExpressCard	67
Inserting an ExpressCard	67
Removing an ExpressCard	68
Hardware upgrades	69
Identifying installed drives	69
Handling drives	69
Using optical drives (select models only)	69
Inserting an optical disc (CD or DVD)	70
Removing an optical disc (CD or DVD)	70
When the disc tray opens	71
When the disc tray does not open	71
Using external drives	72
Using optional external devices	72
Using an optional external MultiBay or external MultiBay II	73
Inserting and replacing memory modules	73
MultiBoot	80
About the boot order device	80
Enabling boot devices in Computer Setup	80
Considering boot order changes	81
Choosing MultiBoot preferences	81
Setting a new boot order in Computer Setup	82
Dynamically choosing a boot device using the F9 prompt	82
Setting a MultiBoot Express prompt	82
Entering MultiBoot Express preferences	83
Computer Setup	84
Starting Computer Setup	84
Using Computer Setup	84
Navigating and selecting in Computer Setup	84
Restoring factory settings in Computer Setup	85
Computer Setup menus	85
File menu	85
Security menu	86
System Configuration menu	86
Routine care	89
Cleaning the display	89
Cleaning the keyboard	89
Traveling and shipping	89

Match case Limit results 1 per page

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.

By including the EWF configuration interface in your configuration and building it into your image, you

enable use of the EWF command line utility and the corresponding commands.

To use the EWF command line utility, follow these steps:

Select

Start

Run

Type

CMD

in the Open field to access the system DOS prompt.

Click

Type

ewfmgr c:

at the prompt.

Press

enter

Enhanced Write Filter