I can build a 3.5" that runs on drive 1 all day long and it works great on my FD-500, FD-501 and FD-502. With pin changes. However, I can only ever achieve Drive 1 , most software wants Drive 0. So I end up paring the drives with a classic 5.25 drive as Drive 0 and a 3.5 with Drive 1.
I have...