On Sat, 15 Feb 2014, Jules Richardson wrote:
Somehow (I blame ~20 years of brain rot) I'd
completely forgotten that DOS
maintains a "last access" timestamp for files, and so every time I copied
data from the HD drive it would update the FAT on the floppy, which was
then causing a variety of errors when subsequently trying to delete the
file via the DD drive. Urgh. :/
Anyway, problem solved (I *really* need to find another DD drive; my only
other one that I have here seems to have some major alignment problems)
WRITE-protect should be enough to prevent that.
Also, earlier versions of DOS keep a file modifictation time, NOT a file
access time. Can you back off the DOS version of the machine with the HD
drive?