TjLaZer, I agree with the mickey mouse comment for ICD partition software!! P.O.S it is :-)
Have you tried to change the boot priority for the a590, so it is handled first within autoboot structure AmigaDOS.
I forget what the priorities should be, -10 I think, for scsi boot devices. If you change the ICD to a lesser priority, around +5 or the same as floppy you should get both device drivers to co-exist
Hope it works :-)
Az