I've had a couple of corruption problems with CF cards when using the Mac. If you start by formatting the card on the Mac, it seems to work better. However, I've found that if I access the CF card through the iLiad, it still gets corrupted, even though it was formatted on the Mac. This may be because I have a cheap card, or because I'm on OSX 10.3.9, or for some other reason that wouldn't affect you. I'm only passing this along to suggest that you try some tests of your own and see if you have the same problem. It's quite annoying to lose everything on the card and have to restore from backups (if you have them). I lost all the notes I took at a conference that way.