I get that too !
well I did, as I have now moved the 20Gig disk into the AmigaOne.
but I would still be interested in the fix. there were some notes in the boingbag2 or the os3.9 install amigaguide, but they didnt make a lot of sense at the time.
/edit
forgot to say that I was using the IdeFix'97 board and software from Jens Schönfeld (via power computing !), and OS3.9 BB2.