Re: DVD verify with growisofs works, CD verify with wodin fails, but both written correctly

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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