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.