[lug] proper way to MD5SUM a cdrom?

[Dhruva B. Reddy]

I sparked a similar thread on this list 2 years ago
(http://archive.lug.boulder.co.us/bymonth/2002.06/msg00172.html).

I have been using the suggestion in this post
(http://archive.lug.boulder.co.us/bymonth/2002.06/msg00176.html) and it
works great.

Note that all of the approaches suggested in response to my post involve a
file-by-file comparison, rather than an image/device comparison.  I get
a list of checksums from the original file tree, then mount the image
(http://tldp.org/HOWTO/CD-Writing-HOWTO-3.html, see "Test the
CD-image") and get a list of checksums for that, then mount the final
product (the CD) and do the same.

-d

On Mon, 14 Jun 2004 at 11:46 -0600, Sean Reifschneider soliloquized thusly:
> On Sat, Jun 12, 2004 at 06:39:41PM +0000, D. Stimits wrote:
> >Just a question on verifying CD-R's. I have the ISO, and have run md5sum 
> >on it, it looks good. Then I burn it with cdrecord. How do I verify the 
> 
> Doing an md5 of the whole disc may work, but you may run into padding
> issues, where the CD has padding that the ISO doesn't.  You can md5sum
> the individual files within the ISO easily enough and that will solve
> the padding issue.
> 
> Unfortunately, simply doing md5sums on the invididual files won't tell
> you if a particular file was only readable after trying for several
> seconds or minutes.  So, an md5sum is a good first try at verifying, but
> we found that using that as our verification mechanism meant that we had
> a substantial number of users getting unreadable discs from us.
> 
> Sean
> -- 
>  Before you criticize someone, you should walk a mile in their shoes.  That
>  way, when you criticize them, you're a mile away and you have their shoes.
> Sean Reifschneider, Member of Technical Staff <jafo at tummy.com>
> tummy.com, ltd. - Linux Consulting since 1995.  Qmail, Python, SysAdmin
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