@xenomorph This is how I learned about overlapping.
I plotted 1tb drive on machine #1.
Moved 1tb drive to machine #2 to mine.
Plotted 2tb on different drive on machine #1.
After 2tb was plotted moved both drives to machine #1.
Fired it up and got the "overlap" warning.
This happen because machine #1 doing the plotting didn't have the files from the 1tb drive when I started plotting the 2tb drive.
If I would've left the 1tb drive plugged to machine #1 while it was plotting the 2tb drive the overlap wouldn't of happened.
The plotting always start at #1. So if you plot on one drive then swap in another drive to plot you have to figure out where the last drive stopped and start the next one from that point. If their all plugged in together you won't have to worry about this as the plotter will see the files on the other drives plugged in.
Hope that makes sense. I know sounds a little confusing but it not after you see.