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Disk Image is a single file or storage device that holds a replica of all data on a storage medium or device, such as a hard drive, tape drive, CD, DVD, floppy disk or key drive. A disk image is usually created through a sector-by-sector replication of the original - or source - storage medium, including the structure (directories and folders) and contents (files).

Source: https://www.techopedia.com/definition/12705/disk-image