This command outputs the length of an iso9660 file system that is contained in 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 (or errors) it will output the size of the iso9660 file system in bytes. This can now be a large number (> > 4 GB).
|-x||output in humanly readable form the block count and the block size. Output uses the term "sectors" for "blocks".|
|only has affect when "-x" is not given. The number output (if no errors) is the iso9660 file size in bytes divided by <num>. So if <num> is the block size then the output number will be the block count.|