I'm setting these two (now two!) problematic drives aside until I can find a version of DiskWarrior that runs under system 7. (I am stalking ebay with hope. DiskWarrior 3, which has turned up in the past, supposedly bundles a version of DiskWarrior 2.)

I've been trying to use Norton and MacTools on the formerly working HD, but I think it's only made things worse. Oh well, I didn't have any data I cared about on that drive, so I'm sure I'll figure something out eventually. If I have to erase and reformat, so be it.

I am definitely thinking about the SCSI2SD option, as well. I've been wanting to try one of those.