The cables are correctly attached as far as I can see - while there's nothing on the adaptor to key in the IDE cable, it matches the orientation of the (working) ones coming from the A1200 and HDD, and I still doubt that I'd be able to eject the drive from software if something like that was wrong.
I've ran FindDevice (this is in utilities/IDEFix for me) and it's listed (unit 3, combo48x) under both scsi.device and atapi.device. I've tried clicking the atapi device before and pressing "use" which doesn't seem to have done anything.
Cheers