Re: DVD+/-R writers
>From: Andy Polyakov <appro@fy.chalmers.se>
>> DVD+R usually does not know the size of the medium when it starts
>> writing and therefore writes the TOC after the data. With DVD-R and DVD-RW
>> and cdrecord you write in SAO mode which causes the TOC to be written first
>> and the data to be written later without the need to reposition the laser.
>High frequency DVD+ ADIP makes it possible to reposition the laser with
>adequate accuracy. Adequate enough to maintain compatibility with
>DVD-ROM. This was discussed already long time ago. And as already said
>implementing DVD+R SAO would *not* improve compatibility with DVD-ROM,
>so there is no point to complain about lack of it. In other words single
>DVD+R recording mode is more than enough. A.
Please don't repeat unproven statements. We did already discuss this and you
never have been able to prove your claims.
In order to make a recording that is as good as a real SAO recording (as you
may have it e.g. with DVD-R) you need to be more acurate than the size of a
single bit. I am sure that both, DVD+R and DVD-R are no better than approx. one
byte.
BTW: High frequency ADIP is not a grant for high positioning accuracy. Left
alone, it would be much worse than the ADIP + Prepits in DVD-*. Only the fact
that DVD+ uses phase shifts (as marks similar to the pre-pits) makes
DVD+ usable....
Jörg
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin
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