Actually, I do think I mean MSDOS. I've never had the dox for the bridgeboard (tho I did have Transformer in the day).
During the BB setup, it appears I was able to set up a directory called C on an Amiga formatted HD. It's confusing (to me) because of course I also have the Amiga C directory on a different [boot]drive. I'm just trying to write a few MSDOS files to an HD properly -- while in the MSDOS environment.
That said, I'd much rather resolve the checksum/validation issue.
Thanks.