ISO disc images are uncompressed and do not use a particular container format they are a sector-by-sector copy of the data on an optical disc, stored inside a binary file. There is no standard definition for ISO image files. And like any other ISO image, it may be written to an optical disc such as CD or DVD. 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 name ISO is taken from the ISO 9660 file system used with CD-ROM media, but what is known as an ISO image might also contain a UDF (ISO/IEC 13346) file system (commonly used by DVDs and Blu-ray Discs). In other words, it is an archive file that contains everything that would be written to an optical disc, sector by sector, including the optical disc file system. An ISO image is a disk image of an optical disc.
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