The most common uses for an ISO image is to burn the data to a blank CD-R or DVD-R. When you do this, you’re creating an identical copy of the original disc. It even carries over the original file and volume label information. These ISO files are uncompressed and don’t contain any specific container format. With that in mind, ISO images can be extremely large in file size. They’re a sector-by-sector clone of the data on the original optical disc, and all of that data is actually stored inside a binary file. It even contains the binary image of the optical disc’s file system and is copied over exactly as it sits on the disc. ![]() So, when you go to burn the ISO image to a new blank CD-R or DVD-R, you really are getting an exact clone of the original disc, right down to the file system information.
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