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This command outputs the length of an iso9660 file system that is contained in the given file. That file may be a normal file or a block device (e.g. /dev/hdd or /dev/sr0). In the absence of any switches (and errors) it will output the size of the iso9660 filesystem in bytes. This can now be a large number (>> 4 GB).
The size of the file (or block device) holding an iso9660 filesystem can be marginally larger than the actual size of the iso9660 filesystem. One reason for this is that cd writers are allowed to add "run out" sectors at the end of an iso9660 image.