Being able to set the image file size it needed if your media is a set size eg. a CD or DVD
usage for a cd for instance would be GHOST.EXE -SPLIT=600 -AUTO
If you split the image file as you create it, use the -SPLIT switch it will limit the size of each segment to 600 megabytes. When the image is completed (when all the image files have been saved for that one image), you will be prompted to enter the first disk again.