Burning 2 DVD simultaneously... slow

[William Park]

My CPU is 3.2GHz dual-core, and I was burning Debian-6.0 DVD 1-8
actually.  My HD is ubiquitous 500GB SATA, so it should be fast enough.
The command I use is

    growisofs -dvd-compat -Z /dev/dvd=debian-6.0.0-amd64-DVD-1.iso

Maybe it's the program, because it's designed for generating ISO
structure on the fly.  But, I'm reading straight ISO files without doing
anything.
-- 
William

On Mon, Feb 21, 2011 at 03:20:50PM -0500, ted leslie wrote:
> I have set up a box to do 4 at a time, and experienced similar.
> the issue was, that in the burning, the process is assembling the iso
> (on the HD or in memory as it goes) and this takes CPU, at the time
> i just had single core.
> if you have the ISO's all on hd, then to do 2 dvd burns you are just
> reading from the HD (2 iso's concurrently) and writing to your two dvd burners,
> but if you don't burn from pre-assembled iso files,
> you are asking the burn process (both of them) so read
> the files from HD and assemble them on fly,
> then out to the DVD. If you have lots of small files as well
> you are looking at a lot of head movement on the HD,
> and also DVD burners can be quite fast, not as fast as a
> HD , but still pretty quick. To rule out iso assembly issues,
> you should attempt the dual burn from just ISO files,
> and if your HD is say 2x faster then the combined throughtput burn
> of your dvd burners, then you would expect the dual burn to take about
> as fast as a single.
> 
> tl
> 
> On Mon, Feb 21, 2011 at 12:42 PM, William Park <opengeometry-FFYn/CNdgSA at public.gmane.org> wrote:
> > I usually burn 1 DVD at a time, so I didn't noticed this before.  When
> > burning 2 DVD-RW simultaneously (one SATA burner and one USB burner),
> > the speed crawls and fluctuates.  I would've thought modern computer is
> > more than capable of handling 2 DVDs at the same time.  Anyone
> > experienced this?
> > --
> > William
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