ISOSIZE(8) System Administration ISOSIZE(8)NAMEisosize - output the length of an iso9660 filesystem
SYNOPSISisosize [options] iso9660_image_file
This command outputs the length of an iso9660 file system that is con‐
tained 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).
Show the block count and block size in human-readable form. The
output uses the term "sectors" for "blocks".
-d, --divisor number
Only has an effect when -x is not given. The value shown (if no
errors) is the iso9660 file size in bytes divided by number. So
if number is the block size then the shown value will be the
The size of the file (or block device) holding an iso9660 filesystem
can be marginally larger than the actual size of the iso9660 filesys‐
tem. One reason for this is that cd writers are allowed to add "run
out" sectors at the end of an iso9660 image.
util-linux June 2011 ISOSIZE(8)