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Disk Images ExplainedA disk image file (or simply a disk image) is a binary copy of an entire disk or drive. Disk image files contain ALL the data stored on the source drive, including not only its files and folders, but also its boot sectors, file allocation tables, volume attributes and any other system-specific data. Actually, a disk image is not a set of files or folders, but a duplicate of the raw data of the original disk, sector by sector. Because disk images contain raw disk data, it is possible to create an image of a disk written in an unknown format or even under an unknown operating system. File formats of disk images usually depend on the type of its source drive. For example, ISO files contain CD images; IMG (or IMA) files usually contain images of hard drives, floppies and removable disks. Disk images are widely used by CD recording software for transferring and storing CD data. Many CD recording programs use their own formats for disk images. Disk images are also an integral part of the Linux operating system. With Linux you can 'mount' a disk image file and use it as a virtual drive.
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