"Disk cloning" is a process of creating the identical copy of a
physical disk on another physical disk.
The process of deploying multiple identically configured systems by
cloning the hard drive of the reference installation is often called
"Disk imaging" implies that a resulting
"image" is stored in the file rather than on a disk. The image
file is mostly used to hold a dormant copy of data. This copy would not
be readily accessible, for there exists no easy way to access the
filesystem stored inside the image file.