HP 4320t Mobile manual HP Write Filters, File-Based Write Filter

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2 HP Write Filters

The File-Based Write Filter (FBWF) and the Enhanced Write Filter (EWF) provide two distinct ways to provide a secure environment for your computer by protecting it from unauthorized writes to storage and file systems. FBWF operates at the file level, and EWF operates at the sector level. Only one write filter can be selected and active at one time.

File-Based Write Filter

The File-Based Write Filter (FBWF) provides a secure environment for your computer by protecting it from undesired read and write access to write-sensitive or read-only storage. FBWF redirects all writes targeted for protected volumes to a RAM cache called an overlay.

FBWF has only two states, enabled or disabled, and does not have an overlay volume. When FBWF is disabled, all previous changes are lost.

Using the File-Based Write Filter command line utility

Windows® Embedded includes the FBWF command line utility. This utility enables you to issue a set of commands to the FBWF driver, report the status of each protected overlay, and report the format of the overall FBWF configurations.

By including the FBWF configuration interface in your configuration and building it into your image, you enable use of the FBWF command line utility and the corresponding commands.

To use the FBWF 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 fbwfmgr c: at the prompt.

5.Press enter.

When you enter the fbwfmgr [boot command] syntax, use the following commands in the boot command variable of the command line:

●/disable

Disables the write filter on the next restart.

●/enable

Enables the write filter on the next restart.

●/displayconfig

Displays all current configuration information for the write filter including filter state, protected volumes list, cache compression state, overlay cache threshold, cache pre-allocation status, and write through paths.

●/overlaydetail

File-Based Write Filter 11

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Contents HP 4320t Mobile Thin Client Product notice Safety warning notice Iv Safety warning notice Table of contents Applications Multimedia Inserting a digital card Removing a digital card Hardware upgrades Page Display Identifying the hardwarePointing devices TopLights Buttons, switches, and speakers Fn key KeysEnvironmental Notices FrontLeft side Right side Bottom Wireless antennasIdentifying the labels Component Description Using the File-Based Write Filter command line utility HP Write FiltersFile-Based Write Filter Using the File-Based Write Filter status utility Using the File-Based Write Filter configuration interfaceEnhanced Write Filter Using the Enhanced Write Filter command line utilityAll Using the Enhanced Write Filter configuration interfaceUsing the Enhanced Write Filter status utility Local drives ConfigurationDrive Z Drive CMapping network drives User accountsRoaming profiles Creating a new user accountPage Remote Desktop Connection ApplicationsHP Remote Graphics Software RGS TeemTalk Terminal EmulationHP ThinState Capture Microsoft Internet Explorer Windows Media PlayerHP ThinState Deploy Using pointing devices Using the keyboardPointing devices and keyboard Displaying system information Switching the screen imageDecreasing screen brightness Increasing screen brightnessUsing the keypads Enabling and disabling the embedded numeric keypad Using the embedded numeric keypadSwitching key functions on the embedded numeric keypad Using an optional external numeric keypadPower control and light locations PowerUsing power-saving states Setting power optionsShutting down the computer Initiating and exiting SleepUsing the Power Meter Using battery powerDisplaying the remaining battery charge Inserting or removing the batteryCharging a battery Managing low battery levels Identifying low battery levelsResolving a low battery level Conserving battery power Storing a batteryDisposing of a used battery Connecting the AC adapter Using external AC powerPage Using multimedia hardware Using the audio featuresMultimedia Using the audio-in microphone jack Using the video featuresUsing the audio-out headphone jack Adjusting the volumeUsing the Hdmi port Using multimedia software Opening preinstalled multimedia softwareUsing multimedia software Preventing playback disruptions About integrated wireless devices WirelessUsing wireless controls Using WlanConnecting to a Wlan Setting up a WlanIdentifying a Wlan device Using wireless security featuresUsing a modem Connecting a modem cableModem and LAN Connecting a country- or region-specific modem cable adapter Adding new locations when traveling Selecting a location settingSolving travel connection problems Viewing the current location selectionSet the modem to ignore dial tones Connecting to a local area network Using passwords SecurityProtecting the computer Using administrator and user passwords Setting passwords in WindowsAutomatic logon Manual logonUsing a setup password Setting passwords in Computer SetupAdministrator logon Managing a setup passwordEntering a setup password Installing a security cableUsing a USB device Connecting hardwareConnecting a USB device Securing USB portsUsing the USB Storage Options utility Inserting a digital card Using Media Card Reader cardsRemoving a digital card Using ExpressCards Configuring an ExpressCardInserting an ExpressCard Removing an ExpressCard Identifying installed drives Hardware upgradesUsing optical drives select models only Handling drivesRemoving an optical disc CD or DVD Inserting an optical disc CD or DVDWhen the disc tray does not open When the disc tray opensUsing optional external devices Using external drivesInserting and replacing memory modules Using an optional external MultiBay or external MultiBayPage Page Page Page Page Page MultiBoot About the boot order deviceEnabling boot devices in Computer Setup Choosing MultiBoot preferences Considering boot order changesSetting a new boot order in Computer Setup Dynamically choosing a boot device using the F9 promptSetting a MultiBoot Express prompt Entering MultiBoot Express preferences Starting Computer Setup Computer SetupUsing Computer Setup Navigating and selecting in Computer SetupComputer Setup menus Restoring factory settings in Computer SetupFile menu Security menu System Configuration menuComputer Setup menus Computer Setup Cleaning the keyboard Cleaning the displayRoutine care Traveling and shippingPage USB IndexHdmi Hdmi USB

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