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Disk Images

Page history last edited by Dmitry Sokolov 4 years ago

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https://en.wikipedia.org/wiki/Disk_image

"CD image" redirects here. For ISO 9660 image files, see ISO Image.

A disk image, in computing, is a computer file containing the contents and structure of a disk volume or of an entire data storage device, such as a hard disk drive, tape drive, floppy disk, optical disc or USB flash drive. A disk image is usually made by creating a sector-by-sector copy of the source medium, thereby perfectly replicating the structure and contents of a storage device independent of the file system. Depending on the disk image format, a disk image may span one or more computer files.

The file format may be an open standard, such as the ISO image format for optical disc images, or a disk image may be unique to a particular software application.

The size can be huge because it contains the contents of an entire disk. To reduce storage requirements, if an imaging utility is filesystem-aware it can omit copying unused space, and it can compress the used space.