[CentOS] About md5sum

Tue Nov 20 14:49:25 UTC 2007
Ray Leventhal <centos at swhi.net>

Fajar Priyanto wrote:
> Hi all,
> A friend of mine gives me a copy of Centos5 DVD.
> I then make an iso of it using dd if=/dev/cdrom of=centos5.iso command.
> I then check it using sha1sum.
> But the result is different than of listed in Centos website.
> Should it the same? Or we simply cannot compare sha1sum from burned DVD to 
> that of 'unburned' iso file?
> Thanks.
AFAIK, the checksum should be matched on the ISO file pre-burn, against
the checksum posted on the server from which the ISO was downloaded. 
Any differences in hash against the burned media may be due to
additional metadata added by the burning engine.