Re: [gentoo-user] new machine : DVD drive

Pandu Poluan <pandu@××××××.info> wrote:

> On Aug 20, 2012 8:51 PM, "Pandu Poluan" <pandu@××××××.info> wrote:
> >
> >
> > On Aug 20, 2012 7:47 PM, "Andrea Conti" <alyf@××××.net> wrote:

> > +RW *can* be erased, or else it won't be called RW :-)
> >
> > That said, the difference is much deeper than differing metadata. Among
> which :
> >
> > * +RW uses Phase Modulation, -RW uses amplitude modulation. This gives
> +RW much more robustness than -RW

This is also wrong:


DVD+RW use 817.4 kHz in the pregrove and periodically inverts the phase as 
sector start marker. This is cheaper to press (as the stamper will last for more 
press cycles) but it is not as accurate as DVD-RW and you get floating bader 
quality during the life cycle of the stamper.

DVD-RW uses 140.6 kHz in the pregrove and in addition lans pits between the 
groves to mark the sector start, This is much more precise than what DVD+RW 
uses. Since aproc. 4 years, there is a new patented stamper method that uses 
dints in the pregrove instead of pits on top of the land. This is as precise as 
the pit on land method, compatoble to this method and allows stampers that are 
as cheap as the DVD+RW stampers. There is no degradaraion of the stamper 
accuracy as with DVD+RW, even with the new modified version.

Jörg

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