Illegal field in command descriptor block error

[Wayniac]

I used to get exactly the same error message in v2 of Juggler.

I now use v3.00.755-FTU and have successfully backed up all my self-boot DC games.

I use a CD-ROM drive to copy from- not my Burner (Traxdata 8432+).
You may still get errors however, if your writer cannotw write in full "RAW DAO" mode. You need this in order to backup DC self-booters.

What's your setup? What readder/writer/aspi version?

Have you also tried Clone cd? I get acceptable results with CLoneCD, although not as good as Juggler.