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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