If I remember correctly, hdtoolbox is only set to see certain scsi devices. If the hd card isn't using scsi.device, you might need to modify the tooltype for hdtoolbox to let it know what the device name is. (Don't remember the tooltype, but it might be in the wb3.1 manuals.)
I think the error is telling you that it simply can't find a device and therefore thinks no controller is pressent.
