<Tr> <Th> Type of format </Th> <Td> Disk image </Td> </Tr> <Tr> <Th> Standard </Th> <Td> ISO 9660, UDF </Td> </Tr> <P> An ISO image is a disk image of an optical disc . 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 . ISO image files bear the . iso filename extension . 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). </P> <P> 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 . Software distributed on bootable discs is often available for download in ISO image format . And like any other ISO image, it may be written to an optical disc such as CD or DVD . </P>

A file that has an .iso extension indicates what type of file
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