You thought correctly. If you ran the builder image and it didn't wipe your filesystems, that's because you didn't press Enter at the "disk appears to be already built" prompt which appeared on the serial port.

A week wouldn't be complete if Jim didn't get a modest dope slap from any of a number of FAQs! I thought I pressed "Enter" the 2nd time!!

It is going better now. Emplode has gotten back into the mode where it crashes at the very end of a synch operation and the player needs to be rebooted to reconnect. I remember this from long ago. It doesn't yet seem to be fouling up database, but it is alarming my navigator!