I had the same problem with my A3000+Cyberstorm mkII.
It would not recognise the new Seagate Barracuda drive I had.
Found I had to enable the synchronous, fast synchronous and SCSI 2 Queing modes on the SCSI controller.
Download A3000 SCSIPrefs MUI from Aminet to do this. The settings are stored in a little bit of memory inside the RTC, so if the battery goes flat, the settings will be lost and you'll have to re set them.
Also I found the Barracuda drive was not recognised if I had the old 60Mb Quantum drive on the controller at the same time.
Don't forget to double check the termination is correct both at the motherboard and drive ends of the cable!