Just for kicks and grins, I pulled out my old 8" "Special Maintenance Disk". It contained a "Sync Write" program that allowed other floppies to be formatted for character generator messages. I just spun it around to find the index and remembered all the holes in the older hard sectored disks. I don't remember if this one is DSDD or not but I do remember that they offset the indexing hole, dependent upon the disk type. I wonder if anyone is still using the character generators that this was used with. I'll bet that it has been 20 years since I fixed one.
Joe
