[k3b] [Bug 385635] New: verification appears to be via checksum comparison rather than actual data comparison

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=385635

            Bug ID: 385635
           Summary: verification appears to be via checksum comparison
                    rather than actual data comparison
           Product: k3b
           Version: unspecified
          Platform: Debian stable
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Verfication
          Assignee: k3b at kde.org
          Reporter: zcw913 at aserty.com
                CC: michalm at jabster.pl, trueg at kde.org
  Target Milestone: ---

version is 2.0.2 (I am in the process of burning the latest Debian DVDs for an
upgrade)

Checksum comparison seems a rather dubious way of verifying a burn and gains
you nothing in performance:

chrisw at acer-Aspire-5610:~$ time cat /dev/sr0 >/dev/null

real    8m51.207s
user    0m0.128s
sys     0m10.596s
chrisw at acer-Aspire-5610:~$ time md5sum /dev/sr0
9c8951b69992c0a14821da030f27198d  /dev/sr0

real    8m49.449s
user    0m29.040s
sys     0m9.092s
chrisw at acer-Aspire-5610:~$ time cmp /dev/sr0 '/work/Debian
9.1.0/firmware-9.1.0-i386-DVD-1.iso' 

real    8m49.058s
user    0m32.916s
sys     0m20.336s
chrisw at acer-Aspire-5610:~$

Checksum(s) can still be calculated, but, I think it's important to do a proper
read back check.

A graph of the read speed would also be helpful in showing if the burned disc
has any bad spots.

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