I'm having a problem like this too. I have one SCA drive that jams the SCSI bus no matter what, and I have another that refuses to work if you plug in a terminator (the drives themselves have no termination options). I don't think either of these drives are broken (they spin up and so forth), but there's definitely something wrong here.

If the problem is in the SCA adaptor, are there any out there that do termination of their own, and do it properly?