Like RetroGamer I'm new here, but just last week I dusted of my precious Amiga 1200 which had been languishing in the loft for the past 8 years or so. I got hold of a CF kit and installed that as my HD with no problems. I also purchased Amiga Explorer from Cloanto so that I could transfer adf's over to the Amiga via null modem cable. The adf's have been giving me similar problems to what RetroGamer describes. I would transfer adf's over to RAM in the Amiga then copy them over to my CF HD. Now if I transferred them straight from RAM to DF0 using ADF-Blitzer no problems would occur. However, if I transferred the adf's from RAM to the CF HD and then used ADF-Blitzer to write to DF0 from the CF HD I would get a floppy called DF0:NDOS which is unusable. If I copy adf's directly over to CF HD using Amiga Explorer and use Blitzer to write to DF0 no problems again. The other strange thing is if I use Blitzer to make an adf from DF0 and write it directly to my CF HD it is unusuble if you then try to use the file to make a new floppy.
My solution was not to use RAM in the Amiga between copying to the CF HD which for some strange reason corrupts the adf. Also do not use ADF-Blitzer to make adf's and write them direct to CF HD, I don't know why but in my case it don't like it.
Nemo