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ID: 27106, Windows XPE Enhanced Write Filter header conversion

by Angus Robertson Email: Anonymous


The Magenta Systems Windows XP Embedded Enhanced Write Filter (EWF) is used to protect one or more disk volumes by intercepting write requests to the volume and redirecting it to an overlay volume, either RAM or another disk.
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For Delphi, Version 5.0  to 14.0 35 downloads
Copyright: No significant restrictions


Size: 374,610 bytes
Updated on Sat, 08 Aug 2009 09:45:49 GMT
Originally uploaded on Mon, 03 Aug 2009 03:44:50 GMT
SHA1 Hash: 4DA566D164655DA8D1CC7888423178FE4514E430
MD5 Hash: 7240E3F3B702D436DE0F50B3947D0CB0

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Description
The Magenta Systems Windows XP Embedded Enhanced Write Filter (EWF) is used to protect one or more disk volumes by intercepting write requests to the volume and redirecting it to an overlay volume, either RAM or another disk. Note the EWF header conversion is only useful on Windows XP Embedded with the Enhanced Write Filter DLL installed. It is not available on Windows XP Pro, or other operating systems.

EWF is designed to protect the Windows boot volume so effectively it's write protected and boots up identically each time, with any changes made to a protected drive being lost on power down. If changes need to be saved, EWF API calls are needed followed by a reboot to actually update the protected drive.

Microsoft provides a command line utility EWFMGR.EXE that reports any protected volumes and provides various commands that will be processed on the next restart of the PC.

The EWF API allows these commands to be made from Windows applications. The Microsoft EWFAPI.H C header file is included, with the Microsoft help file that details the various APIs. The EWF API functions enable applications to query and modify EWF configuration settings for protected volumes. Typical usage scenarios for these functions include:

- Disabling/enabling EWF for a protected volume.
- Restoring or discarding an overlay level.
- Creating a checkpoint by adding an overlay level.
- Committing the current overlay.
- Persisting data through a reboot.

As well as a Delphi conversion of the EWF APIs, this package includes a Windows demonstration application using the APIs. Please note this
program has only been testing on Windows WP Embedded running on a flash memory C drive (IDE interface) with a single overlay in RAM. It has not been tested with a hard disk which potentially offer multiple overlays.

For more information, see http://www.magsys.co.uk/delphi/

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