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Linux 2.6 - man page for isosize (linux section 8)

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ISOSIZE(8)				     SG_UTILS				       ISOSIZE(8)

NAME
       isosize - outputs the length of an iso9660 file system

SYNOPSIS
       isosize [-x] [-d <num>] <iso9660_image_file>...

DESCRIPTION
       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".

       -d <num>
	      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.

       The  size  of  the  file (or block device) holding a iso9660 file system can be marginally
       larger than the actual size of the iso9660 file system. One reason for  this  is  that  cd
       writers are allowed to add "run out" sectors at the end of a iso9660 image.

sg3_utils-0.91				  December 2000 			       ISOSIZE(8)
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