I use nero ultra 6 to burn my AVI files on to a DVD data disc. I choose this option because I want to edit them at a later date. Usually I burn a 4gb file and it is saved as a WMV AVI. Lately however these 4gb files are coming out as 250mb read only files. I've tried using different discs but the results are the same. Anybody have an idea of what is going on?