I was having trouble because I was putting the *volume* image into the SCSI2SD rather than the *disk* image. turns out partition tables are important lol
turns out this hang was caused by the SCSI2SD firmware, which was uhh shamefully out of date. with the latest version it works and i can partition the drive!
@tubetime I'm on a apple ii group on facebook and in the 90s I had a Performa 475 I think but never had the apple II card. There is a mastodon apple program I think?