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Date: Thu, 12 Feb 2009 17:46:40 -0700
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To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: Gary Kline <kline@thought.org>, Polytropon <freebsd@edvax.de>,
	FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject: Re: How-to erase a DVD-RW
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Wojciech Puchar wrote:
>>> which is exactly what i suggested - writing 0 byte disc
>>
>>
>> that writes binary 0, the ASCII "NUL" character.  /dev/zero is NOT a 
>> zero-size file.
>
> yes it is
>
> [wojtek@wojtek ~/NOBACKUP]$ dd if=/dev/null of=/dev/null bs=1
> 0+0 records in
> 0+0 records out
> 0 bytes transferred in 0.000037 secs (0 bytes/sec)
>
>
> /dev/null simply gives EOF when trying to read
we're not talking about null
we're talking about zero


Try again, maybe?