Windows Xp Embedded; Enhanced Write Filter (Ewf) - Omron DYALOX INDUSTRIAL PC Quick Start Manual

3.2 Windows XP Embedded

Windows XP Embedded for the DyaloX IPC contains the following software:
.NET Framework 2.0
Internet Explorer
Visual Basic Runtime Library files v5.0 & v6.0
C Runtime Library (4.0.1183.1)
Remote Desktop support
Remarks on configuring Windows XP Embedded:
The Windows firewall is enabled when the product is shipped from the factory.
Make the appropriate settings as required.
The administrator password is not set when the product is shipped from the
factory. Set a password as required. If a password has been set, however, a
keyboard will be required when logging on.
To use a USB-connected floppy disk drive, keyboard, or mouse when starting
Windows to update the BIOS or recover the Windows system, select Advanced
from the BIOS set-up menu and set Legacy USB Support to Enabled.
Windows XP Embedded is an OS designed for embedded use. Some application
programs that operate on the Windows XP Professional OS may not operate on
the Windows XP Embedded OS of an DyaloX Industrial PC. In addition, the
Windows components cannot be added and deleted by selecting Add or Remove
Programs from the Control Panel.

3.3 Enhanced Write Filter (EWF)

The Enhanced Write Filter (EWF) is a special function in Windows XP Embedded that
protects a volume from write access. When you enable EWF for a certain volume you prevent
any data to be saved to the storage disk. Instead all data is saved to the RAM. This means
when you reboot the IPC the data is lost.
EWF provides the following features:
Write protects one or more partitions on your IPC
Keep original disk contents
Data can be saved while EWF is disabled (commit) using EWF API
By default the EWF is disabled. You should be careful when big amount(s) of data is involved
as RAM is used to store it.
Some EWF commands you can use:
Show EWF status:
Enable EWF:
Write data to disk:
Help information:
More information on EWF can be found in Appendix 2 of our manual or on:
http://www.microsoft.com/embedded
EWFMGR C:
EWFMGR C: -enable
EWFMGR C: -commit
EWFMGR -?
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