Either change device to scsi.device (if you want to get rid of asimcdfs) or copy asim_atapi.device to the emergency disk (if you want to continue using asimcdfs, but then you also have to install asimcdfs again).
Changing unit is stupid if you didn't change the hardware because the unit number has to match the place on the IDE cable where the drive is connected to. Unit 0 = master, unit 1 = slave.