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General Support - How can I check an iso before burning it?

feffer777 - 23.07.2006, 03:46 Uhr
Titel: How can I check an iso before burning it?

I pestered a few people on the irc with this one (sorry slh) but I'm still confused about md5 checksums. Once I download an iso, I understand how to find the md5, burn it and check the cd, but how do I know whether the download is good in the first place? On the Kanotix 2005-04 release, the md5 sums are given on the website for each iso, but I couldn't find an md5sum for the KANOTIX-2006-easter-rc4 release anywhere. Shouldn't there be an md5 checksum posted for easter as well? If that's not needed, why are they posted for 2005-04 iso's?

In the end, I just booted the cd and it worked fine, but evidently I'm missing how to check whether a downloaded iso is ok before I burn it.

Thanks,
Ron

jackiebrown - 23.07.2006, 04:18 Uhr
Titel: RE: How can I check an iso before burning it?

i see them
http://kanotix.org/Downloads-req-viewdo ... cid-1.html

feffer777 - 23.07.2006, 06:04 Uhr
Titel:

Actually going to that link, I see one file that gives the md5sum for Kanotix-2005-04, but nothing for KANOTIX-2006-easter-rc4. I did finally find a valid link, though, by doing a google search for "KANOTIX-2006-Easter-RC4.iso.md5" Maybe, that's what slh meant all along. If so, I'm sorry for being so dense. Anyway the link is:

http://ftp.wustl.edu/pub/linux/distribu ... x/KANOTIX/

Regards,
Ron

h2 - 23.07.2006, 06:22 Uhr
Titel:

easter rc 4 md5:
c10e91895ad111553a6ad765c16f17a1 *KANOTIX-2006-Easter-RC4.iso

go to front page link:
http://debian.tu-bs.de/project/kanotix/preview/

and you'll see it there, it's just not obvious if you only click the left side bar link

t-bone - 23.07.2006, 06:32 Uhr
Titel:

If you are talking about viewing the contents in an ISO file, then you can use MountISO, which can be found here: http://www.kde-apps.org/content/show.php?content=11577

It works really well! Sehr glücklich

kb0hae - 24.07.2006, 00:53 Uhr
Titel:

Hi Folks. The easiest way that I have found to find the actual MD5 checksum is to drag the ISO into K3B. The checksum will be diaplayed so that you can compare it to the MD5 checksum file that you downloaded. Then you can just set K3B to burn the ISO in DAO mode at 8x (or less if your drive can go slower). This works whether you have the HD install or a live CD. I know that there are other ways to find the MD5 checksum, but I try to apply the KISS (Keep It Simple Silly) principle as much as possible.

markb - 24.07.2006, 11:20 Uhr
Titel:

kb0hae hat folgendes geschrieben::

It's much easier to download the tiny file.iso.md5 file (while waiting for the file.iso file to download). Save them in the same dir then just type "md5sum -c file.iso.md5". That command will calculate the iso md5 checksum and compare it to the contents of the md5 file. Why try to visually compare 2 big numbers when your PC can do it? I find this technique much quicker, easier, and more accurate than using k3b.

HK-47 - 24.07.2006, 11:56 Uhr
Titel:

h2 hat folgendes geschrieben::

go to front page link:
http://debian.tu-bs.de/project/kanotix/preview/

this is off-topic, and maybe stupid, but what's KANOTIX-2006-VDR-RC6.iso?

as for checking the md5 checksum, i also use the method posted by markb. it's pretty hard to compare checksums manually. the method he posted is probably the easiest and most accurate way to do it.

datebro - 24.07.2006, 17:18 Uhr
Titel:

Zitat:

but what's KANOTIX-2006-VDR-RC6.iso?

Its almost the same than rc4, but with addititonal Software "vdr"~"Linux_Video _Disk_Recorder" installed and configured.

Greetings
Datebro

h2 - 24.07.2006, 20:35 Uhr
Titel:

to check iso md5 sum:

1. Download iso and iso.md5 file into same directory

2. cd to that directory

3. If you want to be lazy:
3a. type to get directory contents: ls
3b. highlight md5 file with mouse
4. enter: md5sum -c <click mousewheel>
5. it will calculculate and compare.

that's it. the highlight to paste and mousewheel click to paste is a neat shortcut I recently learned, which takes one of my pet annoyances and makes it pleasant. This works anywhere on your desktop, including konsole

If you don't use the -c flag and put the iso file, not the md5 file, it will calculate and output the md5 sum

Note that the iso.md5 file is a text file in this format:

<md5 sum> *<file name of iso>

Swynndla - 26.07.2006, 04:04 Uhr
Titel:

"md5sum -c file.iso.md5" will check the downloaded ISO to make sure there are no download errors.

But after burning, to check for burning errors, you can do:
md5sum -b /dev/cdrom
... and then visually compare the output with the md5 contained in the file.iso.md5" file, or you can mount the cd and do:
cd /media/cdrom
md5sum -c KNOPPIX/md5sums
... or you can use the "testcd" grub cheat code on boot.