Enhanced Write Filter - Siemens SIMATIC IPC427D Operating Instructions Manual

5.2

Enhanced Write Filter

Purpose and function
The EWF (Enhanced Write Filter) is a function that is only available for Windows Embedded
operating systems. It provides write protection that can be configured by the user.
You can use the Enhanced Write Filter to boot Windows Embedded Standard from read-only
media, for example, CFast card, or provide individual partitions with write protection.
EWF can be used to minimize write access to CFast cards. This is important because the
write cycles on CFast cards are limited due to technical reasons. We therefore recommend
using EWF if you work with CFast cards.
EWF is indispensable if HORM or compressed NTFS is used.
NOTICE
Activate only one write filter per partition - otherwise you risk data loss
EWF and FBWF are preinstalled in the SIMATIC IPC images.
Ensure that only one write filter is enabled on a partition, otherwise you risk data loss.
Note
The Enhanced Write Filter is deactivated in the Windows Embedded Standard default state.
After the operating system and programs have been installed, you should back up your data
and then enable the EWF.
Set EWF
The following programs can be used to install, enable or disable the EWF:
● EWFMGR.EXE
● SIMATIC IPC EWF Manager
The SIMATIC IPC EWF Manager is pre-installed and included on the USB flash drive.
Start the SIMATIC IPC EWF Manager as follows:
● "Start > All Programs >Siemens Automation > SIMATIC > EWF Manager > EWF
Manager
Configure the SIMATIC IPC EWF Manager as follows:
● "Start > All Programs > Siemens Automation > SIMATIC > EWF Manager > EWF
Settings
or
● Click the "SIMATIC IPC EWF Manager" icon in the system tray.
SIMATIC IPC427D
Operating Instructions, 05/2017, A5E31347215-AB
Extended device functions
5.2 Enhanced Write Filter
63