I was plotting a 1tb hdd and cut it off after ten minutes. When I look at the plot it show the plot name and said it was 931gb.
So I tried mining and it worked but found no dl but was listed on miner as 931gb.
So that told me that the xploter builds the structure for all the nonces first then fills them up with nonces. but its like an ice cube tray it could be half full with water but takes up just as much space as the other full trays.
So if xplotter stops or gets done quickly better to do it all over.