Checking the integrity of a CD/DVD media

[Tony Nelson]

At 4:16 PM +0100 7/20/06, Paul Smith wrote:
>On 7/20/06, Nicolas Mailhot <nicolas.mailhot at laposte.net> wrote:
>> > Is there some way of checking the integrity of a CD/DVD media?
>>
>> 1. checksum the files using md5sum/sha1sum
>> 1b sign the result with gpg
>> 2. check the burnt files against your checksums
>
>Thanks, Nicolas, but in case the media is already recorded and without
>any access to the original files?

dd if=/dev/dvd of=/dev/null bs=2048 count=5000000

It won't copy all those blocks (about 10 GB), but if the DVD is good it
will copy the "expected" size from a single or double-layer DVD.
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