James, it looks like latest version of mnib does allow you to write back to actual disks afterall. http://c64preservation.com/dp.php?pg=mnib (has may19 2008 version) DOS release of MNIB tools. Requires CWSDPMI. http://btmgr.sourceforge.net/cwsdpmi.exe http://c64preservation.com/files//mnib/mnib-dos.zip OpenCBM release of MNIB tools. Requires OpenCBM 0.4.0 or higher http://c64preservation.com/files//mnib/mnib-win32.zip *** let me know how it goes. ***