- Notes, cautions, and warnings
- Introduction
- Getting Started
- Notable User Features
- Notable Administrator
Features
- Using Administrative Tools
- Using TPM and BitLocker
- Configuration Manager
- Device Manger: Bluetooth Wireless Connections
- Connecting to a Printer or an External Device
- Display: Dual Monitor Display
- Network and Sharing Center: Wireless Local Area Network (WLAN)Settings
- Realtek HD Audio Manager
- Setting the Region and Language
- Sounds and Audio Devices
- User Accounts
- WDA
- Windows Defender
- Additional Administrator
Utility and Settings Information
- Automatically Launched Utilities
- Utilities Affected by Log Off, Restart, and Shut Down
- Using the File Based Write Filter (FBWF)
- Understanding the NetXClean Utility
- Saving Files and Using Local Drives
- Mapping Network Drives
- Participating in Domains
- Using the Net and Tracert Utilities
- Managing Users and Groups with User Accounts
- Changing the Computer Name of a thin client
- System Administration
- Restoring Default Settings
- Accessing Thin Client BIOS Settings
- Imaging Devices with the Dell Wyse USB Firmware Tool
- Configuring and Using Peripherals
- TightVNC (Server)
- TightVNC (Server) — Pre-requisites
- Using TightVNC to Shadow a Thin Client
- Configuring TightVNC Server Properties on the Thin Client
- Mobile broadband
- Using Dynamic Host Configuration Protocol (DHCP)
Dell Wyse Enhanced Microsoft Windows Embedded Standard 7P for Dell Latitude 3460 Wyse TC and Dell Latitude E7270 Wyse TC Administrator’s Guide
Using the File Based Write Filter (FBWF)
The File Based Write Filter provides a secure environment for thin client computing by protecting the thin client from undesired flash memory writes flash memory is where the operating system and functional software components reside. By preventing excessive flash write activity, the File Based Write Filter also extends the life of the thin client. It gives the appearance of read-write access to the flash by employing a cache to intercept all flash writes and returning success to the process that requested the I/O.
The intercepted flash writes stored in cache are available as long as the thin client remains active but are lost when the thin client is restarted or switched off. To preserve selected changes, the selected files of the cache can be transferred to the flash on demand by using WDM software or manuallyby using Commit in the File Based Write Filter Control dialog box; alternatively, if the files affected by the changes are not known, the changes can be made after disabling the File Based Write Filter using the File Based Write Filter Control dialog box, and then re-enabling the File Based Write Filter, For more information, see Setting the File Based Write Filter Controls .
The File Based Write Filter can be controlled either through the command line (fbwfmgr) or by double-clicking the File Based Write Filter icon in the Administrator system tray. The File Based Write Filter can flush specified files to the flash from cache only up to the point when the commit is performed; if more writes are performed on the files that have been flushed, then these files must be flushed/committed again if the additional changes also need to be preserved.
The File Based Write Filter can also be enabled/disabled through the command line or through the File Based Write Filter Enable/Disable desktop icons. The status (enabled/disabled) of the File Based Write Filter is displayed by the File Based Write Filter status icon in the system tray green indicates that the File Based Write Filter is enabled and red indicates that the File Based Write Filter is disabled.
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NOTE:
- Contents of the File Based Write Filter cache should never be flushed if it is eighty-percent or more full. The Administrator should periodically check the status of the cache and restart the thin client if the cache is more than eighty percent full. Note that alternatively an administrator can configure the client to reboot if the FBWF cache is 90 percent or more full. By default the client is configured to reboot if the FBWF cache usage exceeds 90 percent.
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A Terminal Services Client Access License (TSCAL) is always preserved regardless of File Based Write Filter state (enabled or disabled). If you want to have other registry settings preserved regardless of File Based Write Filter state, contact support for help as described in Technical Support.
- WARNING: It is highly recommended that Windows write filter is kept enabled during normal use of thin clients. It should be disabled only by administrators while making necessary changes. Extended use with write filters turned off can reduce the life of your flash drive. It is a good practice to have write filters enabled to ensure device security.
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