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?
--
*** e-Mail is NOT a SECURE channel ***
Do NOT transmit sensitive data via e-Mail
Do NOT open attachments nor follow links sent by e-Mail
James B. Byrne mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3