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Date: Wed, 13 Apr 2005 04:54:04 -0700 (PDT)
From: Arne "Wörner" <arne_woerner@yahoo.com>
To: "Søren" Schmidt <sos@DeepCore.dk>
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cc: FreeBSD Multimedia <freebsd-multimedia@freebsd.org>
Subject: Re: Followup to DVD Burning question
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--- Søren Schmidt <sos@DeepCore.dk> wrote:
> Arne Wörner wrote:
> > That's how I do backups with a DVD-RW:
> >   tar cf - ... | dd of=/dev/acd0 obs=32k conv=osync
> > 
> > Unluckily my DVD-RW's cannot be used for UFS with my
> > burner... I do not know why.
> 
> DVD-RW doesn't quite cut it for UFS, you need DVD+RW media for
> that.
>
Why? I can read and write the same block of a DVD-RW round robin.
I mean:
> dd if=a of=/dev/acd0 bs=32k count=1 oseek=10
> dd if=/dev/acd0 of= /dev/null bs=32k count=1 iseek=10
> dd if=b of=/dev/acd0 bs=32k count=1 oseek=10
> dd if=/dev/acd0 of= /dev/null bs=32k count=1 iseek=10
> dd if=c of=/dev/acd0 bs=32k count=1 oseek=10
> dd if=/dev/acd0 of= /dev/null bs=32k count=1 iseek=10
...
This looks just like a hard disc to me...

If the answer would be too complicated, I withdraw my question
hereby...

-Arne



		
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