The problem is, that many hard drives just will not run with Amiga hardware. OR at least not all of it. I have an IBM SCSI drive in my A2000 that works fine on the GVP SCSI card, but will work at all on the 2091.
I have an Hitachi 2.5" in my A1200 that works great, and one IBM 2.5" that runs well (all ide here) BUT I also have three IBM 2.5" ide drives that refuse to run in the A1200 no matter what is done!
There are quirks like this throughout any make of drive.
It would be a great idea for Amiga users to list exactly which make & nodel drive that they are running - through which computer and interface! Way back when, such a list was started, but apparently died.