Well, when you make the ISO you select a layerbreak. If you want to burn the ISO to disc and use that layerbreak you select "Don't Update IFO/BUP files option". If you change your mind and want to change the layerbreak you can still do that just before burning by selecting a new position and not selecting "Don't Update IFO/BUP files option" I guess.
Well, when you make the ISO you select a layerbreak. If you want to burn the ISO to disc and use that layerbreak you select "Don't Update IFO/BUP files option". If you change your mind and want to change the layerbreak you can still do that just before burning by selecting a new position and not selecting "Don't Update IFO/BUP files option" I guess.