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Date: Thu, 12 Feb 2009 10:16:26 +0100 (CET)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Gary Kline <kline@thought.org>
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Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject: Re: How-to erase a DVD-RW
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> iS there an easy way (by cmd-line) to erase a used DVD-RW?
> I tried K3B and can't figure out where to click!

simply don't use "easy to use GUI" just use actual program which is 
growisofs and dvd+rw-format

recording 0 bytes DVD will do the trick, i don't see explicit "cleaning" 
option in growisofs now.

dvd+rw-format will clear DVD+RW disk.