[Udpcast] No success with imaging XP

I'm trying to image a 20G drive containing XP Pro (NTFS) to a single file on a Linux receiver and then transimt this image back to the same XP box to test things are working ok. I can create the image with no problems (no compression used) and then udpcast the image back to the same machine it was taken from. When I reboot this machine I get "A disk read error occurred - Press Ctrl+Al+Del to restart" I've tried several times with no success - anyone got any ideas or managed to get this to work? Even the XP disk will not boot to allow repair - PC just hangs after it has started inspecting setup. Thanks Lee Baker