And like any other ISO image, it may be written to an optical disc such as CD, DVD and Blu-Ray. Software distributed on bootable discs is often available for download in ISO image format. ISO images can be created from optical discs by disk imaging software, or from a collection of files by optical disc authoring software, or from a different disk image file by means of conversion.
The data inside the ISO image will be structured according to the file system that was used on the optical disc from which it was created. ISO images are expected to contain the binary image of an optical media file system (usually ISO 9660 and its extensions or UDF), including the data in its files in binary format, copied exactly as they were stored on the disc. Īn optical disc image (or ISO image, from the ISO 9660 file system used with CD-ROM media) is a disk image that contains everything that would be written to an optical disc, disk sector by disc sector, including the optical disc file system.
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