This new disk, usually an external device, now contains a fully deployed operating system and can be used to quickly deploy a fresh copy of the base operating system and any installed applications and data
Installing an OS on multiple computers takes time. To simplify installation a cloning option may be used
1) A computer is selected to act as a base system and gets the regular operating system installation process
2) After the OS is installed in the base computer, a specific program is used to duplicate all the information on its disk, sector by sector, to another disk
Installation Alternatives