Way out of my league now. Are you saying when Ventura was installed on the LaCie HD it also put a Ventura disk Image on my internal HD that has Monterrey and that allowed it to boot into the LaCie?
At this point, I may be out of my own league, so I'm going to stop guessing.
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
