Arthur Marsh wrote, on 2009-03-16 21:16:
> Hi, I just posted this to the Debian bug-tracker (which hasn't responded
> with a bug number yet).
>
> If anyone can offer some suggestions to try to see why CD verify fails
> even when the CD is written correctly, I'd be happy to burn a few CD-RW
> disks and observe the results.
>
>
> Package: k3b
> Version: 1.0.5-3+b1
> Severity: normal
>
>
> Hi, I recently acquired an LG DVD writer identified in dmesg as:
>
> hdb: HL-DT-STDVD-RAM GH22NP20, ATAPI CD/DVD-ROM drive
> ide-cd: hdb: ATAPI 48X DVD-ROM DVD-R/RAM CD-R/RW drive, 2048kB Cache
>
> When I burned a DVD (which used growisofs), verify succeeded, but
> when I burned a CD (which used wodin), verify failed.
>
> I then found a shell script to re-check the md5sum of the burned media
> against the md5sum of the .iso file:
>
> #!/bin/bash
> #shell script to verify a burned iso
>
> ISOFILE=$1
> echo "Isofile: " $ISOFILE
> DVDDRIVE=/dev/hdb
> BYTES=2048
>
> #Get the number of extends
> NROFEXTENDS=$(($(ls -l $ISOFILE | awk '{ print $5 }') / $BYTES ))
> echo "Nr of extends: " $NROFEXTENDS
>
> #Get MD5 sum of DVD
> dd if=$DVDDRIVE bs=$BYTES count=$NROFEXTENDS | md5sum
>
> #Get MD5 sum of iso file
> md5sum $ISOFILE
>
> and this showed that the CD burned with k3b, which called wodin, had in
> fact been written correctly.
>
> If someone needs me to do further tests I will purchase some cd-rw disks
> and be happy to try again.
and of course, the cd-rw (restricted to 4 X burn speed) verified fine.
Arthur.
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