Blanking DVD+RW: Mepis 3.43 vs Mepis 6.0 - What changed?

Hello,

I recently upgraded from Mepis 3.43 to Mepis 6.0.

In Mepis 3.43 I could enter konsole and enter the following command to blank (not format) a DVD+RW:

growisofs -Z /dev/scdN=/dev/zero

Side Note: Where scdN = your device mount point

However, this command doesn't work in Mepis 6.0. The DVD+RW does not blank: It remains full. Here is the output of a recent Mepis 6.0 attempt to blank a DVD+RW (the beginning text is different than it was under Mepis 3.43):

WARNING: /dev/hdd already carries isofs!
About to execute 'builtin_dd if=/dev/zero of=/dev/hdd obs=32k seek=0'
/dev/hdd: "Current Write Speed" is 2.5x1385KBps.
3375104/4700372992 ( 0.1%) @0.4x, remaining 139:09
15237120/4700372992 ( 0.3%) @2.5x, remaining 51:14
26378240/4700372992 ( 0.6%) @2.4x, remaining 38:23

4676943872/4700372992 (99.5%) @2.5x, remaining 0:06
4688150528/4700372992 (99.7%) @2.4x, remaining 0:03
4699291648/4700372992 (100.0%) @2.4x, remaining 0:00
:-[ WRITE@LBA=230540h failed with SK=5h/ASC=21h/ACQ=02h]: Invalid argument
builtin_dd: 2295104*2KB out @ average 2.4x1385KBps
write failed: Invalid argument
/dev/hdd: flushing cache
/dev/hdd: stopping de-icing
/dev/hdd: writing lead-out

Obviously I skipped some of the needless, tedious output and just showed the beginning and end.

Does anyone know why that command no longer works and just as importantly: What must I do to make Mepis 6.0 blank a DVD+RW?

I look forward to your replies. Thanks!

P.S. No, my terminal output does not actually show a 'frown face" like it shows here. I don't know why it is making that "frown face" here on this post. The "frown face" was not in the original terminal output.