@Orjan
This info is from amiga-hardware:
This device is basically a buffered 4-way IDE device for the Amiga which splits the internal IDE Connector into wo channels. The board contains two 2.5" connectors and two 3.5" connectors. Please note that this board does not work correctly with V43 of scsi.device
So, if you have V43 of the scsi.device in your system,
it won't work. I think that's your problem...