Lisa Office System install blues..

I'm having no luck at all installing LOS. I've tried Lisa Office 3.0 and 2.0, but they both claim they cannot write to the disk - I tried two 5M and one 10M ProFile. To my knowledge, none of these have bad sectors. There's no sign that it's even _trying_ to access the disk. The activity light on the ProFile flickers during _detection_ and I can hear it seek. But, when I push the button to initialize it comes back immediately claiming it cannot write. I see no sign any access has occured at this point. If I try to repair the disk, it tells me to contact a service specialist and mentions error 200/662. There's no error 200 listed in the Lisa repair manual, but 662 is ProFile parity error. It's hard to believe that, since the drive passes format and certify on an Apple /// and MacWorksXL on the Lisa has no problem with it. I even tried removing the serialization on Office System disk 1. No joy. Something tells me I'm overlooking the obvious, but darned if I know what I'm doing wrong. Steve --