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Tom Davies wrote:
Hi :)
That does sound hugely useful but please could you let us know the name of the utility you used? If it was for a particular DE i'm sure we could work out the name for another DE if we need to. Just knowing the name of 1 would help!

Also any suggestions on how to use the utility? If it's command-line only i think it's still possible even for us point&click users but we could use a little guidance. Errr, i'm still not in the NA Dvd team but am still interested in how to generate an Md5sum.
Many thanks and regards from
Tom :)

In Linux, it's called "md5sum". As for Windows, Google on "Windows md5sum" to find utilities you can download.

Here's a list of the directory where I downloaded openSUSE:

jknott@linux:~/download/suse/12_2 $ ls -l
total 8903692
-rw-r--r-- 1 jknott users        126 Sep 16 14:41 md5sum
-rw-r--r-- 1 jknott users 4448059392 Sep 16 14:24 openSUSE-12.2-DVD-i586.iso
-rw-r--r-- 1 jknott users 4669308928 Sep 16 14:22 openSUSE-12.2-DVD-x86_64.iso

The md5sum file contains:

26dd6c187f743f3af0cbb31eed138a07  openSUSE-12.2-DVD-x86_64.iso
0373980cd6f270e1172067b86c044633  openSUSE-12.2-DVD-i586.iso

If I run the command md5sum -c md5sum, I get:

openSUSE-12.2-DVD-x86_64.iso: OK
openSUSE-12.2-DVD-i586.iso: OK

This shows both files match their md5sum.

If I run the command md5sum openSUSE-12.2-DVD-x86_64.iso, I get:

26dd6c187f743f3af0cbb31eed138a07  openSUSE-12.2-DVD-x86_64.iso

This matches the value from the web site, and shows the file is OK.

The thing about md5sums is that a small change in the file results in a large change in the file's md5sum. This means that you don't have to check every character. If a few at each end are correct, then in all probability the file is OK.

As I mentioned, disc burner software will generally display the md5sum of a file before you burn the disc. Just check that against the md5sum from the web site. There may be graphical utilities available, but I haven't had the need to use them as the command line utility is so easy to use.

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