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. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20170427/ff1704ec/attachment-0005.sig>