In addition to the duplicated data from a physical disk, ISO files contain all necessary filesystem information from the original medium as well. The ISO standard the ISO files are based in is the ISO-9660 standard. Much more information is saved this way than simply copying files from one disc to another where important information like the disc header information can get lost. These copies can function as backup CDs since they do not differ from the originals when it comes to content. ISO files are used to create exact copies of CDs, DVDs or other media saved on discs like a CD-ROM. The content of the ISO is an exact copy of the content of the original DVD or CD the disc image was created from. ISO is the most common disc image format for both CD and DVD.
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