Disk image is a replica or a copy of the data stored within the disks in your computer. An image drive will contain the contents of your storage media device and provide duplicate structure of such devices.
Disk imaging is a smart feature which helps to restore data from a damaged hard drive. It usually works by copying the entire content stored in partitions, disk details, partition details, & Os partitions by creating a replica of content all the given data will be stored in a network share so that the content of the hard disk can be compressed based on the user's requirements.