I have been restoring a rather iconic (and temperamental!) Mac IIsi.
I have trouble installing System 7.5 on an IBM drive with Apple firmware that OS 7.0 installed just fine on. I am puzzled by the error messages (no detail, just failed, insert disk one, "system was left untouched").
The first issue was caused by a system folder being present on the target drive, albeit in the trash bin (failure on disk 4). Now I am hitting this unhelpful error on Disk 7 (the last).
Disks check out ok and were verified on the same machine/drive.
Tried installing on another hard disk, hit same error, also on Disk 7 (this other disk has an OS on it, but upgrade was progressing smoothly in that case).
Any suggestions? I am thinking of making a new disk 7, just in case, but I don't think that's the issue here. Is there some kind of software lock or protection that System 7 would honor that I need to check?