I am new to cpmtools and follow exactly what you are doing, but unfortunately I have a problem.
I created the dummy file with all E5, but when i execute the command line:mkfs -f s100ide -b dummy.file -b CPMLDR.COM s100ide.dsk
it always tells me 'unknown format s100ide'. Yes, I created and entered it in diskdefs which resides in the same folder as all the other files. If I move the file away then it tells me it cannot find the file - so, what about my 'def' is a problem?
I am using the command prompt in windows 7...
probably something basic, but what am i missing?