Re: [Dvdrtools-users] unable to write dvd-r with linux kernel 1.6

[Bryan J. Smith]

On Fri, 2005-05-13 at 09:37 +1200, Volker Kuhlmann wrote:
> In this case it looks like you may have to erase the disk first,

This is a DVD+R/+RW concept.  In DVD+R/+RW, the organization is
physically the same, and pie-slice MO, hence why you don't understand
how DVD-R is different.

You _never_ "erase" DVD-R.
It is not MO, it is not the same, physical organization as DVD+R
(or DVD-RW/+RW for that matter).

When people "emulate" a CD-R or DVD-R with CD-RW or DVD-RW using
"cdrecord," it is still a completely _different_ physical format, hence
why it typically doesn't work well.  You're telling cdrecord to just do
the "jaggy write" -- i.e., head moves outward, in one, discrete motion,
at the end of each revolution, instead of a gradual, single track.
cdrecord doesn't recommend it, but if you do it, it's up to the reader
to read it.

Most won't unless they are recent.

DVD+R is already physically like DVD+RW, so there is no difference (and
it neither were ever designed for cdrecord or any linear, single-groove
recording program).  DVD+R has _never_ been a "single-groove," hence why
cdrecord is wholly inappropriate (just like any -RW/+RW format).

-- Bryan

Just FYI, unlike DVD-RW/+RW, despite also being MO, you _never_ "format"
DVD-RAM for that matter.  It is physically pre-formatted.  Those who've
seen DVD-RAM know exactly what I mean.


-- 
Bryan J. Smith                                 address@hidden 
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