Finally got to installing my new SCSI2SD on the IIfx and...no dice. Could get drives to format with Lido, but writes more than a few on wouldn’t work. System 6.0.8 installer wouldn’t get past the first “writing Finder”, failing with a -36 error.
I found someone on Reddit saying v6 (which the new SCSI2SD is) is incompatible with really old machines. So I took my v5.1 out of my Quadra 700 and bingo - works perfectly. So far, anyway, but 6.0.8 installed nicely. I think SCSI2SD V6 might not work with a IIfx. I’ll send an email to CodeSrc and see what they say.