Just trying to make sure there is not one of those AH...poo! moments.
I should know. My NS* horizon was hit by lightning back in '79
and spent 6 months tracking down all of the failures. I made the
error described and soon as I hit reset... the boot tracks on
the master disk went away. Fortunately it was not unobtainium
back then so it was a recoverable "very bad moment".
I got and built up the Netronics Explorer8085 to troubleshoot
boards one at a time. Much easier.
If possible read the disks on a PC and save an image. Least
then you can reproduce them.