Disk images became much more popular when floppy disk media became popular, where replication or storage of an exact structure was necessary and efficient, especially in the case of copy protected floppy disks.ĭisk images are used for duplication of optical media including DVDs, Blu-ray discs, etc. The early ones were as small as 5 megabytes and as large as 330 megabytes, and the copy medium was magnetic tape, which ran as large as 200 megabytes per reel. Disk images were originally (in the late 1960s) used for backup and disk cloning of mainframe disk media.
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