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Dell Wyse Windows 10 IoT Enterprise for Wyse 5060 Thin Client Administrator’s Guide

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Unified Write Filter

After system start-up, the Unified Write Filter (UWF) utility is automatically started.

UWF File Folder exclusions:
  • C:\Users\Admin\AppData\LocalLow

  • C:\Users\User\AppData\LocalLow

  • C:\Program Files\Windows Defender

  • C:\Program Files (x86)\Windows Defender

  • C:\Windows\WindowsUpdate.log

  • C:\Windows\Temp\MpCmdRun.log

  • C:\windows\system32\spp

  • C:\ProgramData\Microsoft\Windows Defender

  • C:\program files\Wyse\WDA\Config

  • C:\Users\Public\Documents\Wyse

  • C:\Wyse\WCM\ConfigMgmt

  • C:\Wyse\WCM

  • C:\Wyse\WDA

UWF Registry exclusions:

  • HKLM\SYSTEM\CurrentControlSet\Control\WNT\DWCADTool
  • HKLM\Software\Wyse\ConfigMgmt
  • HKLM\SOFTWARE\Microsoft\Windows Defender
  • HKLM\SYSTEM\CurrentControlSet\Control\WNT\UWFSvc
  • HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\HomeGroup
  • HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkList
  • HKLM\SYSTEM\WPA

Unified Write Filter (UWF) details—Use Unified Write Filter (UWF) to protect your storage media. UWF intercepts all write attempts to a protected volume and redirects the write attempts to a virtual overlay. This UWF improves the reliability and stability of your device and reduces the wear on write-sensitive media, such as flash memory media like solid-state drives. In UWF, an overlay is a virtual storage space that saves changes made to the underlying protected volumes. UWF intercepts all modifications to any sector on a protected volume. A sector is the smallest unit that can be changed on a storage volume. Any time the file system attempts to modify a protected sector, UWF instead copies the sector from the protected volume to the overlay, and then modifies the overlay instead. If an application attempts to read from that sector, UWF returns the data from the overlay instead, so that the system maintains the appearance of having written to the volume, while the volume remains unchanged.

CAUTION:
  • Dell recommends you to enable write filter during normal use of thin clients. It can be disabled only by an administrator while making necessary changes. Extended use with write filters disabled can reduce the life of your flash drive. It is a good practice to enable write filter to ensure device security.

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