A couple of days ago I stumbled across a page describing a similar problem with old Mac Powerbooks.
It turned out to be the IDE driver thinking the CF card was an ATAPI device, but cos the driver was in ROM just like the Amiga, he built a little hardware hack to get around it.
PB150 CF adapter.I doubt this is needed on the Amiga though, I'm using a 64mb CF card with WB3.0 and 3.0 ROMs in one of my A1200s, installed fine with HDToolbox..but then that's no help to you :-(
