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. -- Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial http://linux2.arinet.org 21:45:18 up 2:09, 2.6.22-14-generic GNU/Linux Let's use OpenOffice. http://www.openoffice.org The real challenge of teaching is getting your students motivated to learn. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part. URL: <http://lists.centos.org/pipermail/centos/attachments/20071120/c212b6fd/attachment-0005.sig>
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. HTH, ~Ray
On Tue, 2007-11-20 at 21:45 +0700, Fajar Priyanto wrote:> 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?isosize (along with dd) is your friend. -- Ignacio Vazquez-Abrams <ivazqueznet at gmail.com> PLEASE don't CC me; I'm already subscribed -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 189 bytes Desc: This is a digitally signed message part URL: <http://lists.centos.org/pipermail/centos/attachments/20071120/f83d45fe/attachment-0005.sig>
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. >an afterthought - the subject of your mail was md5sum...the body speaks about sha1sum. They're different mechanisms; comparing a sha hash to an md5 will always be different, I believe. ~Ray
When booting on the DVD it will ask you if you want to test it! You know where every body is always selecting SKIP! You can check it this way On Nov 20, 2007 3:45 PM, Fajar Priyanto <fajarpri at cbn.net.id> 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. > -- > Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial > http://linux2.arinet.org > 21:45:18 up 2:09, 2.6.22-14-generic GNU/Linux > Let's use OpenOffice. http://www.openoffice.org > The real challenge of teaching is getting your students motivated to learn. > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > >-- Alain Spineux aspineux gmail com May the sources be with you