Appendix 2 Using The Enhanced Write Filter; Appendix 2-1 About The Ewf Function; Appendix 2-2 Confirming The Operating State Of The Ewf Function - Omron NSA12-TX11B User Manual

Appendix 2 Using the Enhanced Write
This section describes the use of the Enhanced Write Filter (EWF) for increasing the reliability of the
NSA-series Industrial PC.

Appendix 2-1 About the EWF Function

To protect the OS and application software stored in the Memory Card of the
NSA-series Industrial PC, it is possible to prohibit the writing of data to the Memory
Card. This is done by using the Enhanced Write Filter of the Windows XP
Embedded OS. By using this function, any data that is to be written from the OS or
application software to a Memory Card is emulated in the main memory, so it
appears to the user that the data is written or settings are changed in the same
manner as in ordinary Windows operation, but in reality all data and settings
changes are deleted each time Windows is restarted or the power is turned OFF.
The EWF function is disabled when the NSA-series Industrial PC is shipped from
the factory. To use the EWF function, you must enable it (see Appendix 2-3).
When the EWF function is enabled and it is necessary to update data on the
Memory Card due to settings changes or file updates, the updated content can be
reflected as described in Appendix 2-4. Another way to do this is to disable the
EWF function and update the data to the Memory Card directly, as described in
Appendix 2-5. When any change is made to the EWF function, the Unit must be
restarted for the change to take effect.

Appendix 2-2 Confirming the Operating State of the EWF Function

Display the command prompt screen, then input the following command to confirm
the operating state of the EWF function.
Command: ewfmgr c:
Execution Example
Definition: State
Filter
Displays the operating state of the EWF function.
ENABLED – Indicates that the EWF function is enabled. The function will
emulate writing data to the Memory Card.
DISABLED – Indicates that the EWF function is disabled. Data will be
directly written to the Memory Card.

Appendix 2 Using the Enhanced Write Filter

Appendix 2-1 About the EWF Function
Appendix
Appendix-21