On Mon, Apr 24, 2017 at 12:53:36PM -0400, 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?
It means that you're getting an error while reading one of the sectors
of the DVD. It might be a problem with the disc, but it could also be
a problem with the hardware.
Try doing a dd to copy all the bits to a local file, and pay attention
to see if it has a problem reading the disc. Then run a sha256sum on
the file it created.
--
Jonathan Billings <billings@xxxxxxxxxx>
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