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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