SCSI2SD Mode Page
I've decided to continue anyway, and I am getting a bit further. Importantly, the initialise maintenance pages option has worked. This is the bit where a copyright string is written to a write-once mode page in the Rodime drives. If the page doesn't contain (C)Acorn then it can't be used as a FileStore hard disc, and only these particular Rodime 3000 series drives have the right code page.