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Old 10-10-2006, 12:15 PM   #1
Registered: Feb 2004
Distribution: Slackware
Posts: 52

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Integrity of burnt slackware iso / md5 checksum

I just burned three dvds of slackware 11 iso. All boot the install kernel fine and otherwise seem to be fine (on three different dvd drives).

I ran
md5sum -c slackware-11.0-install-dvd.iso.md5
on the hard disk and it said ok.

However, I used K3B 0.11 and each time, I asked K3B to verify the written data. The first and last time, it went to 99% then said "Error: the written data differs". The second time, it stopped early on and said the same thing. Also, the first time, it said "3720 mb of 3731 mb written" and the last time "3715 mb of 3731 mb written". Nothing at all in the logs to indicate what error it encountered.

I have been using the same dvd burner with K3B under slackware 9.1 for burning something like 1 terabyte of data already, and I have had my share of faulty dvds, but usually it's all-or-nothing, either they make funny noises and they are good for the dustbin, or they work 100%. This is the very first time I burn an iso, so it could be a problem with my version of K3B.

Do I risk anything installing from those dvds ? Is there a way for me to check integrity of files on dvd other than trusting K3B ?

Thanks in advance,
Old 10-10-2006, 07:02 PM   #2
LQ Veteran
Registered: Mar 2003
Location: Boise, ID
Distribution: Mint
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From the command you've listed, it appears you are running the md5sum program against the actual md5sum verification file (eg, the 1K text file containing the md5sum) rather than the actual Slackware ISO image (eg, the 3.8G ISO file). The actual name of the ISO image should be something like slackware-11.0-install-dvd.iso (no trailing .md5 extension) and the command should be something like
md5sum slackware-11.0-install-dvd.iso
The output will be a long series of letters and numbers need to match exactly to the contents of the slackware-11.0-install-dvd.iso.md5 text file. If they don't, then your ISO is corrupt and you'll need to download it again.

I recommend burning at a slower speed than your burner's top speed, and to always use quality, name brand media. Burning at or close to the DVD's top speed and using random no-name blanks almost always leads to coasters. Good luck with it


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