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Re: Chapter 3 and the last (Re: Yamaha CRW2200E under Linux?)




-=O0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~O0=-
"Beware the Jabberwock, my son!
 The jaws that bite, the claws that catch!
 Beware the Jubjub bird, and shun
 The frumious Bandersnatch!"

                       [L.Carrol "Jabberwacky"]

On Thu, 8 Nov 2001, Omer Zak wrote:

> Actually, simulated burning worked when I reduced the speed to 1x, and
> then I fiddled with hdparm.
>
> The final CD-ROM was burned at 4x, with DMA enabled (and 255-sector
> lookahead) for the hard disk, and DMA enabled for the CD-RW.
>
> According to simulation, 8x would have been marginal.
>
> So the underrun hypothesis has been confirmed.
>

:-)

> Since the CRW2200E comes with "underrun protection", my conclusion is that
> this nifty feature needs software support.  I wonder whether it'll be
> supported under Linux sometime.
>
it is supported with GUI named "KonCD", but it had other problems in "on-the-fly"
burning for me, so beware the jabberwack.
[i think it was a matter of (mkisofs||cdrecord) syntaxr].

> On Tue, 6 Nov 2001, Omer Zak wrote:
>
> > Hello Max,
> >
> > On Tue, 6 Nov 2001, Max Kovgan wrote:
> >
> > > > CD-R at 8x speed.
> > > 8x150kbps=300*4=1200 kbps.
> > >
> > > i don't know which harddisk you use and what is its seek/read/write speeds,
> > > your writer has ~8M buffer.
> > > after it begins the operation at x8 it probably has an underrun, and its
> > > happening very quicly, so that cdrecord logging doesn't show it.
> > > try burning at x4 and it maybe will work.
> >
> > I'll try.  Thanks for the suggestion and the back-of-envelope calculations.
> > If your analysis is correct, it means that the underflow protection scheme
> > in Yamaha CRW2200E needs to be activated by software, and that it is not
> > supported by cdrecord-1.9.
>
>                                              --- Omer
> There is no IGLU Cabal.  When a guaranteed response for overrun and
> underrun conditions is available for Linux systems, which based upon
> version 6.4.x of the kernel, and which are used for managing Style-Forward
> wrap engines - then it'll be possible to organize meetings of the IGLU
> Cabal with attendees from several planets and planetoids.
> WARNING TO SPAMMERS:  see at http://www.zak.co.il/spamwarning.html
>
>
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