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ISO file creation -- procedure

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ISO file creation -- procedure

Hi All,

Am creating ISO file for same directory two times and both has different md5sum, Why does it so ?!

Am pretty sure that, there is no change in that directory between the ISO creations, So what could be issue ? Or is there any misunderstanding in the process.

mkisofs -J -R -otest1.iso ./testdir
mkisofs -J -R -otest2.iso ./testdir

Expecting both the md5sum to be same !! but it is not ??

$ md5sum test?.iso
2a1001de29b75013d1bb5a8a787cf2ef  test1.iso
d01b9b1120ec6662d582dc3af6f94338  test2.iso

Side Note: I have related question posted already here, which dont had answer, so tried other ways and the above is one of the doubt in other way...

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pkg2du(1M)						  System Administration Commands						pkg2du(1M)

pkg2du - convert driver packages to Driver Update format SYNOPSIS
/usr/bin/pkg2du [-f] [-v] [-d dir] [-o iso] [-l label] [-r release] pkg [pkg ...] DESCRIPTION
The /usr/bin/pkg2du utility takes one or more packages as input and converts them to Driver Update (DU) format. If the -d option is speci- fied, the resulting DU directory tree is placed in the directory dir. If the -o option is specified, a Solaris ISO image of the DU direc- tory tree is written in the file iso. The ISO image can be burned onto CD/DVD using cdrw(1) or cdrecord(1) (not a SunOS man page) and used during Solaris installation. At least one of the -d and -o options must be specified. If both are specified, then both an ISO image and a directory tree are generated. OPTIONS
The following options are supported: -d dir Directory where the DU directory should be created. -o iso Create a Solaris ISO image of the DU directory. -f If dir/DU or iso exists, remove it without asking first. -l label Label/volume name of the ISO image (if -o option is specified). -r release Solaris release number to use. It takes the form of the return from uname -r command, for example, 5.10. If unspecified, the release number of the currently running Solaris is used. -v Verbose. Multiple -v options increase verbosity. OPERANDS
The following operands are supported: pkg [pkg...] One or more packages to be converted to DU format. EXAMPLES
Example 1 Creating a DU CD/DVD The following commands create a DU CD or DVD containing packages SUNWfoo and SUNWbar. # /usr/bin/pkg2du -r 5.10 -o my.iso SUNWfoo SUNWbar # /usr/bin/cdrw -i my.iso ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |Interface Stability |Committed | +-----------------------------+-----------------------------+ SEE ALSO
cdrw(1), mkcd(1M), attributes(5) mkisofs(8), (/usr/share/man/man8/mkisofs.8), in the SUNWfsman package (not a SunOS man page) SunOS 5.11 29 Jul 2008 pkg2du(1M)

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