Thanks for your response.
1. fresh install of zsdos (as directories were full, even though there was less than a dozen files in total across d: to j:)
2. check the directories
3 directories D: to J: are full
4. clrdir on directories D: to J:
5. check the directories
6. diretories D: to J: are empty
Now I'm going to recreate the files and see what happens.