Other Operating Software
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Operating Manual XCA 1100 / XCA 1200
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Version 12/17
13.2.2
“EWF Configuration”
The Enhanced Write Filter is a component in the Windows Embedded PC
operating system of the XCA Control. It is used to protect one or several
partitions (volumes, e.g. on a SSD) against changes. Write access is
diverted to a so-called overlay (e.g. in system RAM) for the activated EWF.
This is lost after switching off the system. However, to be able to make the
required changes to the system, the contents of the overlay memory can be
written back using the corresponding system command or the EWF can be
temporarily deactivated.
Notes!
When EWF is activated on systems which are not switched off for
longer periods of time, there may be a memory overflow, because the
EWF redirects write accesses to the system partition to a RAM overlay.
(Windows system error "Delayed Write Failed").
Therefore, it may be appropriate to disable the EWF so that the memory
space in RAM is not restricted. This leads to increased writes to the
SSD.
This also deactivates protection for the system partition.
Depending on the respective application, it must therefore be assessed
whether it is possible to operate the system with or without activated
EWF, or whether using a UPS should be preferred.
“Get EWF status”
outputs the current configuration and the status of the EWF.
“Enable EWF”
activates the EWF
“Commit changes”
writes back the contents of the overlay memory.
“Disable EWF Live”
deactivates the EWF
“Reboot”
A status modification of the EWF (with the exception of deactivation) is
merely instructed, but it is actually only executed after a system reboot.
The restart can be triggered immediately with the set "reboot" option
together with the corresponding EWF command.
