I suspect that I am either building the directory wrong or I got something wrong with the file. I'm not sure which it is. I feel I am really close to getting it to work but there is some little thing I missed. I what hoping is that someone could look at my image file and see something obviously wrong or could send me an image of a normal 5-1/4 CPM disk ( hopefully with the same parameters ). You don't have to know any Z8000. You do have to know the inners of CPM.