Files corrupted when copying

[jack_a]

FFS 3.19, Windows 10.
Copying from NTFS external drive to exFAT external drive.
Reformatted drive to NTFS, but no change.

No errors in the logs,
but almost any video file deeper than 2 folders deep gets created, but is filled with empty bytes.
When copying to exFat, some files simply didn't exist, even though the log says they were created.

There were a couple of small files that made it through.

The source drive either has a bad connection or is a little faulty, so I would expect the occasional reconnect (my reason for using this software), but instead all of the files are just dead.

[jack_a]

Nevermind, it was a dud drive. It didn't work with robocopy or simple copy paste either.
Other people have run into the same issue.