[CentOS] sha256sum a dvd

Thu Apr 27 16:58:52 UTC 2017
Johnny Hughes <johnny at centos.org>

On 04/24/2017 11:53 AM, James B. Byrne wrote:
> CentOS-6.9
> I am trying to verify a locally created dvd.  I am using sha256sum in
> this fashion:
> sha256sum /dev/sr0
> Which gave this result:
> sha256sum: /dev/sr0: Input/output error
> So I tried this:
> sha256sum /dev/cdrom
> Which, after some time, also produces:
> sha256sum: /dev/cdrom: Input/output error
> What does this mean and how do I fix it?

If the DVD is a version of CentOS, we include an internal MD5sum check
at the beginning after bootup (it says 'check and install').  That would
verify the content of the payload for CentOS.

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