looking for way to verify whether a CD/DVD was correctly burned

[Charles Curley]

On Tue, Nov 28, 2006 at 10:35:43PM +0000, Paul Smith wrote:
> On 11/28/06, John Aldrich <john at chattanooga.net> wrote:
> >> > > Is there some way to verify whether a CD/DVD was correctly burned?
> >> >
> >> > In K3b you have the option to verify written data. See
> >> > Project:Burn:Writing:Options:Verify written data.
> >>
> >> Thanks, Zoltan, but I was looking for a command line solution.
> >>
> >Use the MD5sum or SHA1 sum and check it against the CD/DVD.
> 
> Could you please give some more details?

There are two things you can do:

1. Compare images.

  * Get a file with the md5sum of the image. Verify it against the
    image when you download it:

    md5sum -c md5sums

  * Burn the image. Then compare the image against the burned medium:

    diff /dev/hdd image.iso

2. Compare file by file.

  * Check the md5sum of the image as above.

  * Burn it.

  * Mount both, and compare them.

    mkdir foo
    mount -o loop image.iso foo
    mount /dev/hdd /media/cdrecorder
    diff -r --brief foo /media/cdrecorder

And umount/eject as appropriate when you are done.

I prefer the file by file comparison because I'm interested in the
files rather than any padding ot other miscellaneous data the burn
software may have sent to the burner.

-- 

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