@mxc Logical partitions were an issue with FOG 1.2.0 when OS type was set to Windows as far as I can remember.
Best to debug things is to start the job/task in debug mode. When creating a capture/deploy task there is a checkbox “Schedule task as a debug task”. Starting the client you’ll get to a linux shell and you can start the task running the command fog from there (description will be displayed as well). Then you can step through the whole process by hitting ENTER. As well taking a picture or video (slow motion!) is always a great way to find out what’s going wrong. When reporting an error we need the exact error message (plus FOG version, server OS, image type and OS type) to be able to understand and reproduce the error.
GPT/MBR is a big chapter. GPT often leaves traces on the disk that might cause an issue. There is a tool called fixparts that you can use from the debug shell as well.