As a former 686B VIA southbridge owner (A7V series motherboard), I'd say you have things under control. The latest 4in1 drivers is always a good place to start with that thing.
If your test was good with a 300MB video file, I'd think you should be golden for the cross-channel IDE work. (Although you might want to try it with a bunch of tiny files and see what happens...) I actually had better luck with cross-channel work than I did with on-channel work. Until the whole southbridge blew out, at least. Then it didn't detect any more devices. :lol:
