Drives and UC07

I'm trying to set up a drive to work on my recently-acquired UC07 SCSI controller. It's in a PDP 11/23 PLUS. So far I have tried 3 drives: Seagate ST32105N, 2.15GB DEC RH31K-AW (Quantum, unknown model), 1.07GB Quantum LP105S, 105MB Here are the results: Seagate disk: Recognized, fails firmware format DEC disk: Recognized, seems to format successfully in firmware, fails RSTS/E DSKINT Quantum disk: Works fine, no problems. So I know my controller is working. All I really want to do is have about 500MB available to manipulate. I tested with the 100MB disk so I could make sure it worked. I have a second related question - What are the MEDIA IDs for? i.e. 0-RA81, 1 - RA82, 3 - RA90, 4 - RA91, 5 - RA92, 6 - RD54. The only place I see this doing anything is in HARDWR LIST, and it will show whatever media ID you pick. If I could get the space/functionality of an RA81 or 82 on this machine, that would be great. Can someone help me out? Thanks Julian .