note: all = all that i've found
all the "cloning with dd" information talks about how dd copies all the "empty space", but literally all writings seem to be responding to a situation where filesystems fill up the entire disk.
what about the situation where i have two partitions that together fill up only 10% of 160G disk. what is the image size going to be for the good ol "dd if=/dev/sda of=disk.img" run: 16G or 160G?
unless i'm blind, Using DD for disk cloning does not have this information.